We already have the (mostly unused) quick chat emotes built into the game. How great would it be if you could use these to talk to your companions mid battle in a chat that is just for you and your companion. You are suddenly running low on health, you can quick chat "heal me" and if it is not on a cool down and it is on their skill bar, your companion will throw you a heal. "Taunt and Tank the Boss" could send companion after highest health add. "Handle the adds" could increase priority for AOE skills, etc. I know this is probably a lot for their first implementation, but this could be some cool functionality down the road.