If you remember Michael that was what i had in mind some time ago and discussed it with you.
A construction history that lets you adjust the final mesh by tweaking a few steps back..
That would be very cool .
I only know that Solid thinking has got something in that direction see the vide on tweaking a car
But Moi with its easy workflow would have a deep impact into that market if it had some of this feature
http://www.youtube.com/watch?v=hkrZdneJDz4
Peter