As an avid raider, I think something that would help Tanks, Healer, and Dps during operations is a threat indicator. I would like to see on the ops/party frames the person who has threat/aggro have their name plate be outlined or highlighted in red to represent that individual has threat from mobs or a boss, additionally I'd like to see if the tank is losing threat/aggro on mobs or a boss that indicator change to a lighter shade of red showing that they are losing aggro/threat on the target. Of course if this were implemented into the game the player should be able to toggle on or off if they don't want it.