I'm hoping that this hasn't already been suggested (or performed previously), and maybe it would have to be too extensive of a class to begin with; but something dealing with the development of custom subassemblies would interesting. I know they're based off of VBA, but none of the VBA that I've ever come across has given much insight to subassemblies. Just something for consideration.

(If anyone has any other suggestions as far as learning more indepth about subassembly creation, other that just what comes with the program; I'd be greatful.)