Hire the guy from OzCad
I've been testing the WinDoor demo from OzCad and this guy has a gift of making easy to use user interface. Although the BIM features of VW are easier than most programs, this guys manages to take things to a whole new level. I doubt anybody would choose to use the built in window or door tools after trying this plug-in. Again, I'm not bashing VW in any way, just praising the WinDoor plug-in.
So my adwise to Nemetschek is: Hire the guy from OzCad, buy his WinDoor plug-in and integrate it into VW and then have him direct a team of programmers to improve all the parametric tools such as the stair tool, roof tool, wall tool and so on.