Bungie added a new gesture in the TDB expansion, and it looks suspiciously like an erect middle finger! I jest, seriously though, it can be hard enough coordinating a firefight with microphones active, I doubt gestures would be of much use. Perhaps a system that allowed the user to select an area, choke point or an objective would be of more use?
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Like the gestures in Portal 2's multiplayer. The ability to set a timer or indicate to a very specific area could be useful.