Added danx0r's physics patch, although for now have disabled the lines in Scene.cs, as any changes to prims (like size or position changes) are only updated to the physics engine when you restart opensim. Also prims aren't deleted from the physics engine. These shouldn't be hard to fix.

OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs

@@ -57,6 +57,7 @@ namespace OpenSim.Region.Environment.Scenes
 
         public SceneObjectPart RootPart
         {
+            get { return this.m_rootPart; }
             set { m_rootPart = value; }
         }