diff --git a/OpenSim/Data/Tests/RegionTests.cs b/OpenSim/Data/Tests/RegionTests.cs
index cac8cac3ef..1b93176df6 100644
--- a/OpenSim/Data/Tests/RegionTests.cs
+++ b/OpenSim/Data/Tests/RegionTests.cs
@@ -297,7 +297,6 @@ namespace OpenSim.Data.Tests
             pbshap.ProfileEnd = ushort.MaxValue;
             pbshap.ProfileHollow = ushort.MaxValue;
             Vector3 scale = new Vector3(random.Next(),random.Next(),random.Next());
-            byte updatef = (byte) random.Next(127);
 
             RegionInfo regionInfo = new RegionInfo();
             regionInfo.RegionID = region3;
@@ -336,7 +335,6 @@ namespace OpenSim.Data.Tests
             sop.LinkNum = linknum;
             sop.ClickAction = clickaction;
             sop.Scale = scale;
-            sop.UpdateFlag = updatef;
 
             //Tests if local part accepted the parameters:
             Assert.That(regionh,Is.EqualTo(sop.RegionHandle), "Assert.That(regionh,Is.EqualTo(sop.RegionHandle))");
@@ -369,7 +367,6 @@ namespace OpenSim.Data.Tests
             Assert.That(linknum,Is.EqualTo(sop.LinkNum), "Assert.That(linknum,Is.EqualTo(sop.LinkNum))");
             Assert.That(clickaction,Is.EqualTo(sop.ClickAction), "Assert.That(clickaction,Is.EqualTo(sop.ClickAction))");
             Assert.That(scale,Is.EqualTo(sop.Scale), "Assert.That(scale,Is.EqualTo(sop.Scale))");
-            Assert.That(updatef,Is.EqualTo(sop.UpdateFlag), "Assert.That(updatef,Is.EqualTo(sop.UpdateFlag))");
             
             // This is necessary or object will not be inserted in DB
             sop.Flags = PrimFlags.None;
@@ -469,7 +466,6 @@ namespace OpenSim.Data.Tests
             PrimitiveBaseShape pbshap = new PrimitiveBaseShape();
             pbshap = PrimitiveBaseShape.Default;
             Vector3 scale = new Vector3(random.Next(),random.Next(),random.Next());
-            byte updatef = (byte) random.Next(127);
             
             // Updates the region with new values
             SceneObjectGroup sog2 = FindSOG("Adam  West", region3);
@@ -499,7 +495,6 @@ namespace OpenSim.Data.Tests
             sog2.RootPart.LinkNum = linknum;
             sog2.RootPart.ClickAction = clickaction;
             sog2.RootPart.Scale = scale;
-            sog2.RootPart.UpdateFlag = updatef;
             
             db.StoreObject(sog2, region3);
             List<SceneObjectGroup> sogs = db.LoadObjects(region3);
diff --git a/OpenSim/Region/ClientStack/Linden/Caps/ObjectCaps/UploadObjectAssetModule.cs b/OpenSim/Region/ClientStack/Linden/Caps/ObjectCaps/UploadObjectAssetModule.cs
index c07fc73069..e4bacd4df2 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/ObjectCaps/UploadObjectAssetModule.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/ObjectCaps/UploadObjectAssetModule.cs
@@ -332,7 +332,7 @@ namespace OpenSim.Region.ClientStack.Linden
                 
                 grp.IsAttachment = false;
                 // Required for linking
-                grp.RootPart.UpdateFlag = 0;
+                grp.RootPart.ClearUpdateSchedule();
                 
                 if (m_scene.Permissions.CanRezObject(1, avatar.UUID, pos))
                 {
@@ -345,8 +345,9 @@ namespace OpenSim.Region.ClientStack.Linden
 
             for (int j = 1; j < allparts.Length; j++)
             {
-                rootGroup.RootPart.UpdateFlag = 0;
-                allparts[j].RootPart.UpdateFlag = 0;
+                // Required for linking
+                rootGroup.RootPart.ClearUpdateSchedule();
+                allparts[j].RootPart.ClearUpdateSchedule();
                 rootGroup.LinkToGroup(allparts[j]);
             }
 
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index 7324b26afc..7251bd88ba 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -1714,7 +1714,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             //m_log.Debug("  >>> CrossPrimGroupIntoNewRegion <<<");
 
             bool successYN = false;
-            grp.RootPart.UpdateFlag = 0;
+            grp.RootPart.ClearUpdateSchedule();
             //int primcrossingXMLmethod = 0;
 
             if (destination != null)
diff --git a/OpenSim/Region/Framework/Scenes/SceneGraph.cs b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
index 1af18e7309..82ded28360 100644
--- a/OpenSim/Region/Framework/Scenes/SceneGraph.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneGraph.cs
@@ -1799,7 +1799,7 @@ namespace OpenSim.Region.Framework.Scenes
                             newSet.RemoveAt(0);
 
                             foreach (SceneObjectPart newChild in newSet)
-                                newChild.UpdateFlag = 0;
+                                newChild.ClearUpdateSchedule();
 
                             LinkObjects(newRoot, newSet);
                             if (!affectedGroups.Contains(newRoot.ParentGroup))
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 2ea9854ef2..a0a734499e 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -1157,7 +1157,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                     if (!silent)
                     {
-                        part.UpdateFlag = 0;
+                        part.ClearUpdateSchedule();
                         if (part == m_rootPart)
                         {
                             if (!IsAttachment || (AttachedAvatar == avatar.ControllingClient.AgentId) || 
@@ -1735,13 +1735,13 @@ namespace OpenSim.Region.Framework.Scenes
 
             if (UsePhysics && !AbsolutePosition.ApproxEquals(lastPhysGroupPos, 0.02f))
             {
-                m_rootPart.UpdateFlag = 1;
+                m_rootPart.UpdateFlag = UpdateRequired.TERSE;
                 lastPhysGroupPos = AbsolutePosition;
             }
 
             if (UsePhysics && !GroupRotation.ApproxEquals(lastPhysGroupRot, 0.1f))
             {
-                m_rootPart.UpdateFlag = 1;
+                m_rootPart.UpdateFlag = UpdateRequired.TERSE;
                 lastPhysGroupRot = GroupRotation;
             }
 
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index b68cc9fde6..44f822ce39 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -106,6 +106,13 @@ namespace OpenSim.Region.Framework.Scenes
         SCULPT = 7
     }
 
+    public enum UpdateRequired : byte
+    {
+        NONE = 0,
+        TERSE = 1,
+        FULL = 2
+    }
+
     #endregion Enumerations
 
     public class SceneObjectPart : IScriptHost, ISceneEntity
@@ -254,15 +261,7 @@ namespace OpenSim.Region.Framework.Scenes
 
         private bool m_passTouches;
 
-        /// <summary>
-        /// Only used internally to schedule client updates.
-        /// 0 - no update is scheduled
-        /// 1 - terse update scheduled
-        /// 2 - full update scheduled
-        ///
-        /// TODO - This should be an enumeration
-        /// </summary>
-        private byte m_updateFlag;
+        private UpdateRequired m_updateFlag;
 
         private PhysicsActor m_physActor;
         protected Vector3 m_acceleration;
@@ -884,7 +883,15 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
-        /// <summary></summary>
+        /// <summary>Update angular velocity and schedule terse update.</summary>
+        public void UpdateAngularVelocity(Vector3 avel)
+        {
+            AngularVelocity = avel;
+            ScheduleTerseUpdate();
+            ParentGroup.HasGroupChanged = true;
+        }
+
+        /// <summary>Get or set angular velocity. Does not schedule update.</summary>
         public Vector3 AngularVelocity
         {
             get
@@ -1023,8 +1030,8 @@ namespace OpenSim.Region.Framework.Scenes
                 TriggerScriptChangedEvent(Changed.SCALE);
             }
         }
-        
-        public byte UpdateFlag
+
+        public UpdateRequired UpdateFlag
         {
             get { return m_updateFlag; }
             set { m_updateFlag = value; }
@@ -1309,9 +1316,9 @@ namespace OpenSim.Region.Framework.Scenes
         /// <summary>
         /// Clear all pending updates of parts to clients
         /// </summary>
-        private void ClearUpdateSchedule()
+        public void ClearUpdateSchedule()
         {
-            m_updateFlag = 0;
+            UpdateFlag = UpdateRequired.NONE;
         }
 
         /// <summary>
@@ -2829,7 +2836,7 @@ namespace OpenSim.Region.Framework.Scenes
                 TimeStampFull = (uint)timeNow;
             }
 
-            m_updateFlag = 2;
+            UpdateFlag = UpdateRequired.FULL;
 
             //            m_log.DebugFormat(
             //                "[SCENE OBJECT PART]: Scheduling full  update for {0}, {1} at {2}",
@@ -2845,13 +2852,13 @@ namespace OpenSim.Region.Framework.Scenes
             if (m_parentGroup == null)
                 return;
 
-            if (m_updateFlag < 1)
+            if (UpdateFlag == UpdateRequired.NONE)
             {
                 m_parentGroup.HasGroupChanged = true;
                 m_parentGroup.QueueForUpdateCheck();
 
                 TimeStampTerse = (uint) Util.UnixTimeSinceEpoch();
-                m_updateFlag = 1;
+                UpdateFlag = UpdateRequired.TERSE;
 
             //                m_log.DebugFormat(
             //                    "[SCENE OBJECT PART]: Scheduling terse update for {0}, {1} at {2}",
@@ -3018,45 +3025,39 @@ namespace OpenSim.Region.Framework.Scenes
             const float POSITION_TOLERANCE = 0.05f;
             const int TIME_MS_TOLERANCE = 3000;
 
-            if (m_updateFlag == 1)
+            switch (UpdateFlag)
             {
-                // Throw away duplicate or insignificant updates
-                if (!RotationOffset.ApproxEquals(m_lastRotation, ROTATION_TOLERANCE) ||
-                    !Acceleration.Equals(m_lastAcceleration) ||
-                    !Velocity.ApproxEquals(m_lastVelocity, VELOCITY_TOLERANCE) ||
-                    Velocity.ApproxEquals(Vector3.Zero, VELOCITY_TOLERANCE) ||
-                    !AngularVelocity.ApproxEquals(m_lastAngularVelocity, VELOCITY_TOLERANCE) ||
-                    !OffsetPosition.ApproxEquals(m_lastPosition, POSITION_TOLERANCE) ||
-                    Environment.TickCount - m_lastTerseSent > TIME_MS_TOLERANCE)
+                case UpdateRequired.TERSE:
                 {
-                    AddTerseUpdateToAllAvatars();
-                    ClearUpdateSchedule();
+                    // Throw away duplicate or insignificant updates
+                    if (!RotationOffset.ApproxEquals(m_lastRotation, ROTATION_TOLERANCE) ||
+                        !Acceleration.Equals(m_lastAcceleration) ||
+                        !Velocity.ApproxEquals(m_lastVelocity, VELOCITY_TOLERANCE) ||
+                        Velocity.ApproxEquals(Vector3.Zero, VELOCITY_TOLERANCE) ||
+                        !AngularVelocity.ApproxEquals(m_lastAngularVelocity, VELOCITY_TOLERANCE) ||
+                        !OffsetPosition.ApproxEquals(m_lastPosition, POSITION_TOLERANCE) ||
+                        Environment.TickCount - m_lastTerseSent > TIME_MS_TOLERANCE)
+                    {
+                        AddTerseUpdateToAllAvatars();
+                        ClearUpdateSchedule();
 
-                    // This causes the Scene to 'poll' physical objects every couple of frames
-                    // bad, so it's been replaced by an event driven method.
-                    //if ((ObjectFlags & (uint)PrimFlags.Physics) != 0)
-                    //{
-                    // Only send the constant terse updates on physical objects!
-                    //ScheduleTerseUpdate();
-                    //}
-
-                    // Update the "last" values
-                    m_lastPosition = OffsetPosition;
-                    m_lastRotation = RotationOffset;
-                    m_lastVelocity = Velocity;
-                    m_lastAcceleration = Acceleration;
-                    m_lastAngularVelocity = AngularVelocity;
-                    m_lastTerseSent = Environment.TickCount;
+                        // Update the "last" values
+                        m_lastPosition = OffsetPosition;
+                        m_lastRotation = RotationOffset;
+                        m_lastVelocity = Velocity;
+                        m_lastAcceleration = Acceleration;
+                        m_lastAngularVelocity = AngularVelocity;
+                        m_lastTerseSent = Environment.TickCount;
+                    }
+                    break;
                 }
-            }
-            else
-            {
-                if (m_updateFlag == 2) // is a new prim, just created/reloaded or has major changes
+                case UpdateRequired.FULL:
                 {
                     AddFullUpdateToAllAvatars();
-                    ClearUpdateSchedule();
+                    break;
                 }
             }
+
             ClearUpdateSchedule();
         }
 
@@ -3436,7 +3437,7 @@ namespace OpenSim.Region.Framework.Scenes
             _groupID = groupID;
             if (client != null)
                 SendPropertiesToClient(client);
-            m_updateFlag = 2;
+            UpdateFlag = UpdateRequired.FULL;
         }
 
         /// <summary>
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 29966f9722..71c39b2941 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -3211,7 +3211,7 @@ namespace OpenSim.Region.Framework.Scenes
                 foreach (ISceneObject so in cAgent.AttachmentObjects)
                 {
                     ((SceneObjectGroup)so).LocalId = 0;
-                    ((SceneObjectGroup)so).RootPart.UpdateFlag = 0;
+                    ((SceneObjectGroup)so).RootPart.ClearUpdateSchedule();
                     so.SetState(cAgent.AttachmentObjectStates[i++], m_scene);
                     m_scene.IncomingCreateObject(so);
                 }
diff --git a/OpenSim/Region/Framework/Scenes/Serialization/SceneObjectSerializer.cs b/OpenSim/Region/Framework/Scenes/Serialization/SceneObjectSerializer.cs
index e06a222b15..60cc788dc9 100644
--- a/OpenSim/Region/Framework/Scenes/Serialization/SceneObjectSerializer.cs
+++ b/OpenSim/Region/Framework/Scenes/Serialization/SceneObjectSerializer.cs
@@ -316,7 +316,6 @@ namespace OpenSim.Region.Framework.Scenes.Serialization
             m_SOPXmlProcessors.Add("ClickAction", ProcessClickAction);
             m_SOPXmlProcessors.Add("Shape", ProcessShape);
             m_SOPXmlProcessors.Add("Scale", ProcessScale);
-            m_SOPXmlProcessors.Add("UpdateFlag", ProcessUpdateFlag);
             m_SOPXmlProcessors.Add("SitTargetOrientation", ProcessSitTargetOrientation);
             m_SOPXmlProcessors.Add("SitTargetPosition", ProcessSitTargetPosition);
             m_SOPXmlProcessors.Add("SitTargetPositionLL", ProcessSitTargetPositionLL);
@@ -584,11 +583,6 @@ namespace OpenSim.Region.Framework.Scenes.Serialization
             obj.Scale = Util.ReadVector(reader, "Scale");
         }
 
-        private static void ProcessUpdateFlag(SceneObjectPart obj, XmlTextReader reader)
-        {
-            obj.UpdateFlag = (byte)reader.ReadElementContentAsInt("UpdateFlag", String.Empty);
-        }
-
         private static void ProcessSitTargetOrientation(SceneObjectPart obj, XmlTextReader reader)
         {
             obj.SitTargetOrientation = Util.ReadQuaternion(reader, "SitTargetOrientation");
@@ -1187,7 +1181,6 @@ namespace OpenSim.Region.Framework.Scenes.Serialization
             WriteShape(writer, sop.Shape, options);
 
             WriteVector(writer, "Scale", sop.Scale);
-            writer.WriteElementString("UpdateFlag", sop.UpdateFlag.ToString());
             WriteQuaternion(writer, "SitTargetOrientation", sop.SitTargetOrientation); 
             WriteVector(writer, "SitTargetPosition", sop.SitTargetPosition);
             WriteVector(writer, "SitTargetPositionLL", sop.SitTargetPositionLL);
diff --git a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
index 90cdd7baf4..a2332bb4ec 100644
--- a/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
+++ b/OpenSim/Region/Framework/Scenes/Tests/SceneObjectLinkingTests.cs
@@ -70,8 +70,8 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             grp2.UpdateGroupRotationR(Quaternion.CreateFromEulers(180 * Utils.DEG_TO_RAD, 0, 0));
             
             // Required for linking
-            grp1.RootPart.UpdateFlag = 0;
-            grp2.RootPart.UpdateFlag = 0;
+            grp1.RootPart.ClearUpdateSchedule();
+            grp2.RootPart.ClearUpdateSchedule();
 
             // Link grp2 to grp1.   part2 becomes child prim to grp1. grp2 is eliminated.
             grp1.LinkToGroup(grp2);
@@ -164,10 +164,10 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             grp4.UpdateGroupRotationR(Quaternion.CreateFromEulers(0, 90 * Utils.DEG_TO_RAD, 0));
 
             // Required for linking
-            grp1.RootPart.UpdateFlag = 0;
-            grp2.RootPart.UpdateFlag = 0;
-            grp3.RootPart.UpdateFlag = 0;
-            grp4.RootPart.UpdateFlag = 0;
+            grp1.RootPart.ClearUpdateSchedule();
+            grp2.RootPart.ClearUpdateSchedule();
+            grp3.RootPart.ClearUpdateSchedule();
+            grp4.RootPart.ClearUpdateSchedule();
 
             // Link grp2 to grp1.   part2 becomes child prim to grp1. grp2 is eliminated.
             grp1.LinkToGroup(grp2);
@@ -198,8 +198,8 @@ namespace OpenSim.Region.Framework.Scenes.Tests
             }
 
             // Required for linking
-            grp1.RootPart.UpdateFlag = 0;
-            grp3.RootPart.UpdateFlag = 0;
+            grp1.RootPart.ClearUpdateSchedule();
+            grp3.RootPart.ClearUpdateSchedule();
 
             // root part should have no offset position or rotation
             Assert.That(part1.OffsetPosition == Vector3.Zero && part1.RotationOffset == Quaternion.Identity,
diff --git a/OpenSim/Region/Framework/Scenes/UndoState.cs b/OpenSim/Region/Framework/Scenes/UndoState.cs
index d34d8e55ae..860172c4f7 100644
--- a/OpenSim/Region/Framework/Scenes/UndoState.cs
+++ b/OpenSim/Region/Framework/Scenes/UndoState.cs
@@ -158,6 +158,7 @@ namespace OpenSim.Region.Framework.Scenes
             }
             else
             {
+                // Note: Updating these properties on sop automatically schedules an update if needed
                 if (Position != Vector3.Zero)
                 {
 //                        m_log.DebugFormat(
@@ -181,8 +182,6 @@ namespace OpenSim.Region.Framework.Scenes
 
                     part.Resize(Scale);
                 }
-
-                part.ScheduleTerseUpdate();
             }
 
             part.Undoing = false;
@@ -212,6 +211,7 @@ namespace OpenSim.Region.Framework.Scenes
             }
             else
             {
+                // Note: Updating these properties on sop automatically schedules an update if needed
                 if (Position != Vector3.Zero)
                     part.OffsetPosition = Position;
 
@@ -220,8 +220,6 @@ namespace OpenSim.Region.Framework.Scenes
 
                 if (Scale != Vector3.Zero)
                     part.Resize(Scale);
-
-                part.ScheduleTerseUpdate();
             }
 
             part.Undoing = false;
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
index 83c3b78d65..b3d0dd5dfc 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/LSL_Api.cs
@@ -3330,10 +3330,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
         protected void TargetOmega(SceneObjectPart part, LSL_Vector axis, double spinrate, double gain)
         {
-            part.AngularVelocity = new Vector3((float)(axis.x * spinrate), (float)(axis.y * spinrate), (float)(axis.z * spinrate));
-            part.ScheduleTerseUpdate();
-            part.SendTerseUpdateToAllClients();
-            part.ParentGroup.HasGroupChanged = true;
+            part.UpdateAngularVelocity(new Vector3((float)(axis.x * spinrate), (float)(axis.y * spinrate), (float)(axis.z * spinrate)));
          }
 
         public LSL_Integer llGetStartParameter()
@@ -3595,11 +3592,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                     parentPrim = targetPart.ParentGroup;
                     childPrim = m_host.ParentGroup;
                 }
-//                byte uf = childPrim.RootPart.UpdateFlag;
-                childPrim.RootPart.UpdateFlag = 0;
+
+                // Required for linking
+                childPrim.RootPart.ClearUpdateSchedule();
                 parentPrim.LinkToGroup(childPrim);
-//                if (uf != (Byte)0)
-//                    parent.RootPart.UpdateFlag = uf;
             }
 
             parentPrim.TriggerScriptChangedEvent(Changed.LINK);
@@ -3680,7 +3676,8 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
                     parts.Remove(newRoot);
                     foreach (SceneObjectPart part in parts)
                     {
-                        part.UpdateFlag = 0;
+                        // Required for linking
+                        part.ClearUpdateSchedule();
                         newRoot.ParentGroup.LinkToGroup(part.ParentGroup);
                     }
                     newRoot.ParentGroup.HasGroupChanged = true;