+1 on this. I can import my own cad files if I really need to show something (like vertical towers built out of PRT with open face forward) However, it destroys the ability to create proper gear lists/truss counts and do accurate renders simultaneously.
What would be a really awesome feature is being able to add whatever you needed to a gear count list. Say for instance you do a really complex design with a whole pile of cheeseburoughs and pipe. Being able to call out numbers of CB and quantities of pipe length in the gear report would be amazing. This would also alleviate needing accurate blocks if you could import the actual DWG blocks or SKP files and assign them to show up as a countable item in the gear report.