Hi Michael, this is ready for the next beta. MoI will now preserve stuff in a .3dm file that it does not normally edit. That's things like lights, dimensions, annotation dots, point clouds, and layers and materials.

Layer assignments for individual objects will be preserved if you do not edit them. Anything that you edit in MoI will go on just a single layer named "Default".

Please let me know if it seems to be working right for you once you get a chance to mess with it.

- Michael