For live-flexibility it would be nice to have about 50-100 snapshots, with a vertical sliderbar. And a great thing would be: To right-click a knob (f.e. gain-knob in mic Input section) or a section (f.e. the eq-section) and get a "set value  for all snapshots? <Y> / <N>" function.
In live-situations some settings need to be corrected for all the scenes that are saved, without overwriting the global Settings.
I would nearly never need a digital Live-Mixer again... ;-)