I stand corrected


>>>But you need to realize that direct editing can't perform all the same kinds of operations that history can, because the direct editing mechanisms need to do a kind of reverse engineering of the geometry. That's not particularly feasible for many kinds of freeform surfaces, things like a sweep with a scaling rail modifier applied to it cannot really be automatically reverse engineered, so for example none of the existing direct modeling systems (despite having a tremendous amount of effort and man years invested in them) would be able to recreate the original rail curve and scaling rail for tweaking a freeform one-rail sweep. That's just one example.

Perhaps something like this CoCreate example ? http://www.youtube.com/watch?v=Ni3Z6Tft8sQ