i don't use them much myself, it would be wise to write some of them down, it's not too bad when you're with a group of people and holding a position, but it seems a little risky sometimes, some quick commands would be nice, say there's a single person and a cav is coming from behind, as suggested, "behind you" or something would help, i would also like to see some taunts or something, some battle screams and such would add to the fun...
been able to choose our own voice will be a nice addition aswell...