Can I suggest a fader lock.
I recently did a show for a school. I had programmed all the scenes for the operators, they just had to hit go at the right time.
Throughout the show I noticed that balckouts were not quite blackouts and whilst the fixtures were supposed to be in their home positions they weren't.
On later inspection, I discovered that the operators were accidentally pushing up the faders and the submasters, with their scripts.
Could there be a function to lock all but the playback controls.
Maybe even a lock function, that could be changed in the super user, to optionally decide which functions were locked.