feature request: temporarily suspend history update

 From:  Michael (MMHS)
When editing the source curve of a rather complex derivative object (e.g. the profile curve of a sweep), the program slows down so much because of constantly recomputing (updating) the derivative shape, that it becomes difficult to do the edit. I think if the updating could be suspended (e.g. by pressing the shift key while doing the edit), the workflow could be much improved.

Michael H.