Probably already been mentioned, but I sure would love to have polarity flip on outputs!
I like to flip my frontline wedges when the main system is very audible on stage. Also keeps instrumental signal more in phase when you have them in a rear facing wedge with an amp facing forward 
Super easy to make a few adapters. A spare mic cable and some XLR connectors. Not elegant but it would do the trick.
D.
I’m quite sure I wont find my adapters the moment I need them. You need to mute the amps when you do the switch. And I already have enough stuff in my backpack haha.
It’s far easier to do it in the software. A polarity change require almost no DSP power. It’s easy to implement it in the GUI. It’s a common feature of digital desks. Come on…
Please implement this A&H, please please please.