I have a suggestion as i think it would be very usefull voice communication ther are programs for it skype, ventrilo, teamspeak and many others...
But what about if ther would be a voice communicaton in soldt u would press a button on keyboard and u would say somethin in the microfone and all players on the server would hear it or there would be a team button that you would press the button and only players in our team would hear it!
I think its a pretty good idea post your thoughts about it