Very cool, thanks for the tips, Tyo.
I'd also like to see TF2 style pop-up emotes to convey basic quick information. An ally will see them pop onscreen from your direction and briefly ping the minimap:
press E and a little '+' pops up over your DG, means you need a heal.
press R and a little "stopsign = +" pops up, saying "stop running away, I'm trying to heal you"
press F and a little house sign pops up, means you need to go back to citadel
these are small UI tweaks, but they can make a big difference for a team that isn't on Vent