I would be keen to have the same level of granularity in the users as in the scene menu. I’d like to be able to do a dual surface setup where the each surfaces inputs, busses etc are not changeable (or even viewable) from the other surface.
At the very least, make sure that fader and DCA can be locked out. I can’t let others use mixPad because it’s impossible to lock them out of being able to adjust the FOH mix!