This may have come up earlier in this thread, haven't read them all...

But as a long time Solidworks user, the idea of not being able to change my mind, many steps into a process later, i.e. complete unbreakable history, still makes me twitch. ;) (What if I get something wrong, what if a requirement changes, what if, what if, what if...)

Doubtless its a tall order, but this is a "wish" list so I'm wishing.

(It's cool that at least to some level you can make real time changes profiles/curves without having to start over.)

-GregW