Coroner has stated (under news) that the game will render a separate head-movement of the player that uses free-view in third person. It supports quick gesture based communication between team members in close range by nodding the head and other cool stuff.
What do you guys think about supporting this by altering other forms of talks even more? Team and global text messages could be accompanied by a short radio noise after sending it. By that I mean a short audio signal that is only hearable in a certain radius (like footsteps). By offering a slightly different sound for both teams (to illustrate two teams with different technologies) you could actually find out who is waiting behind "that door" in front of you etc.
On the other hand we often kill teammates by accident and therefore such a system could reduce such incidents.
Example: footsteps are coming from a spot near you! What are you doing? Instead of looking through your the sights of your weapon immediately you could simply write anything like "hello" and the short signal noise of your radio plays (that is only hearable around that place --- locally). If the other player responds and the radio plays the same sound as yours you can be sure that it is a teammate! If it's an enemy it might also be kind of funny in some ways…
By altering the voice chat in a similar way, it would be possible to actually guess where that yelling player is located on the map.
Writing and using voice-chat could be deadly in certain areas and players would have to use the “nod-feature” to survive and stay undetected. Fast, silent and non-verbal communication sounds totally cool and adds to the immersive experience without altering for example the movement-speed of the gameplay (which is quite polarizing in the community anyways).
The maps would have to be designed to allow such tactical commands in a reasonable form, I guess.
I hope I put my point across. Would such a thing be worth the amount of time needed to implement it?