Ok.... But the subd modeler has received the information about the original sharp edges of the model, for instance the edges of the cube.

It seems like your problem would be solved if they had an improved method for building creases, such as building a crease for each sharp edge in the original model that they currently already know about...

Wouldn't that solve your problem? That would also be a more general purpose solution for working in there because it would enable creasing on any imported model.

It seems like a good entry for the Sub-d modeler's wishlist instead of MoI's...

- Michael