Full Open GL in every view. Graphisoft might be heading this way soon. I don't know. Archicad has had disabled options like hidden line view for open GL in the 3d window for some time. Things would surely work a lot faster if everything were done with open GL. No more regenerating sections and elevation etc.
The possibility would be to have two live views open at once (section/ floor plan etc.), and you could select a door in one view and it would highlight and move in all open views.
I'm working on a house renovation. As a test I set up some orthogonal open GL views of the model that corresponds to the sections/ elevations, roof plans, floor plans. It would be very fast if it were possible to work this way.
Add to that a new modeling and object making environment and we'd be in business. I know it easy to say.