I use a Logitech PS2 configuration USB controller. Having to use the keyboard to chat is horribly frustrating for me and 1 out of 2 times gets me killed. I know that's probably very rare and maybe kind of random, but I had to speak up.
I use a microphone and headphones all the time. And I don't spam at all, but I need to chat a lot, and most of the time when that's really the case, time is of the essence.
Eman:"We have two Tyrants attacking the base, what should I build and where shall I build it to best work with you, who also have a construction kit?"
~The human base has just been shot to hades by the combined might of {tH3Hu|_k} and 5uP34m4n.
~Aliens win.
Eman:"Nevermind."
5uP34m4n: gg
{tH3Hu|_k}: 0wN3d XD
Yeah. If I could do any one thing at all to this game, it would be to port it to open frag. But if I could do any OTHER thing at all to this game, it would be to add integrated voice chat. And that's the pertinent part. The other one's not really a feature, so</rant> I digress.
Summary: F1