[Mr Kidnapper]

Well, the mesh is still not referenced from the original, but I suppose that would work.
Unfortunately having new methods and variables for cloned objects isn't possible since that goes against the idea of cloning them while a world is playing. They still have their own separate methods, variables, and events copied from the original though.
I don't see how you couldn't create a kind of mob movement at the world level though. You could add them to a list upon creation and have a world level method act on all of the items in the list.