I don't see why that would be a problem. You would probably just have to give some parameters to the buildings/units you make and it will work.
Some more advanced things might require coding off course (like adding a new race).
also remember that (except for 3ds max being supported, that's a fact) I'm just making conclusions from the little information I have about the editor. I might be wrong in some assumptions
"It is easier to do a job right than to explain why you didn't"