A guildie of mine (thanks Drak) said something last night that gave me this idea. It may be nice for the party leader to be able to execute a /headcount command.
It would count the number of people currently in the same instance as the leader, as well as give a short description of who isn't and where they currently are.
Granted, we can already do this manually by hitting the f1-f12 buttons, seeing who isn't lighting up, then going into the who panel and figuring out where they are. But it might be nice, every once in a while, to be able to do it faster.