While I do agree that the sound of a large number of mechanicallly drawn stops being pushed at exactly at the same instance of time is rather unnatural, I must say that so is the action causing that sound!
Asking sample set producers to create a work around for this does not seem the proper way to avoid this sound. Asking them to pull the stops more gently doesn't do it either, because when the soiund becomes nearly inaudible it would not satisfy those who want the stop noises. Also it would mean to stretch out the sound in time, as it means to pull more slowly, wonder how THAT would then sound with general cancel
Just avoid using pistons and stop noises together on such instruments, or else you simply will need to live with the annoyance of an unrealistic sound caused by an unrealistic action.
Hope this doesn't sound too harsh, but what else can I say?
Best regards
Reiner