Two major problems with multiboxing this game:

1. It's not WoW. The point is PvP and not PvE. Sure, you could PvE your way to high level, but then there isn't any major raid content or other activity to do with your group
2. Collision detection in PvP. The game isn't about insta-gibs, it is about fire and maneuver. With collision detection going on during PvP, good luck finding a spot where your team can stand around, because any major movement will get them separated.