Most of us are not using more than 2-4 rigs for a gig (at least the guys playing the heavier end of the spectrum;)), but often the monitor situation on stage is so bad that it's hard to tell if the correct profile is active.
So in order to avoid accidentally finding myself playing the rhythm parts on the solo patch etc, I keep checking the name of the rig to make sure I'm on the correct one for the part.
That of course can sometimes be problematic (reading the name on a display I mean, especially if the stage is larger), so what I always thought would be fantastic is the option to assign a colour to a rig, that way a brief look across the stage would be enough to confirm that you've got the correct rig active..."ah, red, that's solo..switch...blue, rhythm, perfect".
I'm sure I'm not the only one who'd love this feature?