Have you guys used Mumble's positioning-detection in a actual game?
I have in Project Reality (BF2 Mod)... and there's it's amazing! I mean a must have! Mind you, the community in PR is probably more mature than cRPG.
You'd definitely have a bunch of folks being loud mouth dicks at the beginning of a round. But once you spread out (after the first 30 seconds), you'd only hear those near you. And there's a 1-button "mute-everyone", so you could hit that at the end of a round, and not turn it back on till 30 secs into the game. And I'd suggest detection range to very low. You wouldn't hear folks half-way across the map. Hell, I'd have it set at like 10, maybe 20, feet away.
Basically, it'd allow you to communicate with those around you. Whether telling your guys to go ahead, you can solo this guy. Asking a shielder to defend you while you chop down the door. Tell the 1-h shielder to stop chopping the door and let a hard hitting 2-hander to work on it. Letting a buddy know that someone is coming up behind him. It has all kind of use.
And the best part... if you don't want to use it... you don't have to. Stay on TS with your clan. Use both. You can set a 1-button sound-off for Mumble (muting everyone). You can mute individual players. So those that are total ass-wipes... you'll never have to hear them. And best of all... Mumble automatically puts you in the proper channel (server & team) when you join the game.
Personally, I think Mumble should be included in any slower-paced, team-based combat game.