One thing I think this game needs is a quick chat menu. It makes it easier to get some communication happening with your team and would enhance the team element of the game.
For anyone that doesn't know, the way it works (for example in Enemy Territory)...
The player presses the quickchat button, ie. v

Menu pops up
Then you press a number, for example 1
Then it goes on to the statements menu.
Then if you press 4 for example, it will play a sound to everyone on your team saying "Incomming!" as well as chatting it to them.
So basicly you can yell "Incomming!" by quickly pressing v14