The C4D_MouseIgnore, C4D_IgnoreFoW and C4D_MouseSelect categories play a role.
Then there's the MouseDrag property with these flags:
- DropTarget
- NoClick
- DragSource

And there's the MouseDragImage property.

I think we can unify C4D_MouseIgnore, C4D_MouseSelect and the MoseDrag flags into a single property with these flags:
- DropTarget
- DragSource
- Selectable

Or did I overlook something? Naming suggestions?