I've played several MMO's over the years now, several of them with their own unique features, most with very similar features. One of the most useful and interesting that I found throughout the games I played was in Warhammer Online. They had a very nice system which allowed each player to target one enemy and one friendly target at the same time. this allowed for some interesting mechanics such as directing drain spells or siphon type abilities which you could direct to your teammates. It also made it much easier as a healer to add debuffs or damage to a target while the tank or group was doing well and not in need of heals or buffing.

Is there any thought of adding this mechanic to the game. It seems like such a great opportunity to add more diversity to how certain powers interact and makes certain jobs on a team less boring.