Guys ive been looking at some radio addons and found this http://forums.bistudio.com/showthread.php?t=103472 (http://forums.bistudio.com/showthread.php?t=103472)
There are videos at bottom of the link showing off its abilities but in short you can have separate team channels,its fully compatible with teamspeak,you can have teams on separate ears if your leader so you know who is talking to you,it sounds like a radio and has lots more features/more immersive i will let you read on.
The videos on that link are early versions if you search youtube for acre and arma 2 there are some much better ones.
Logik nice idea but we try and keep are addons to a minimal and everything vanilla to make it easier for everyone to join in. But if it gets too hetic it good to have a point of reference for somewhere to go.
And in addition thanks for all you posts on new bits of info, maps game types it really is appreciated.