I would love to see a feature that allows someone to choose if they want to be a squad leader if the original squad leader drops from the squad.  I hate suddenly being made squad leader in the middle of a battle.

One thing that annoys me is that you can't join a squad when you're dead.  I understand the problem that they had with dead people joining squads and respawning, but you should at least be allowed to join when you're dead.  That's usually the only time I remember to join.  I go to join when I respawn but then I get capped by some spawn camper or the big tank idling outside the base.