Aye, I thought it was a bit of a given too.
One thing I'd quite like to see as well after playing last night, seeming though people seem to only be using mumble when they feel like it rather then all the time - kinda ruining the risk of communication and the general fun of everything, would be some way of making it the only method of comms. I know it's kinda a lame thing to say, but it does ruin the enjoyment of it with everyone switching to VoIP as soon as an enemy might hear you, plus you can't do any of the uber 1337 spexopz keeping your voice down like in teh moviez.
The only way round this would probably be server and player side, with servers disabling VoIP and everyone turning to mumble instead. Obviously it would have to be a fully viable communication system before you could start working toward that, and you'd get a few Ftards that'd use teamspeak and stuff cos they're too dull to play the game properly, but I think servers disabling VoIP once it's not gonna be a pain in the arse for folk would be good. Besides we can always have the fun of naming and shaming people that won't play ball
There is the squad comm problem, but you could probably have a squad level radio layer that's assigned to another button and just do the same as with what I suggested for other radio use and have the voice transmit normally as well as over the radio, so there isn't the same problem as you would have with VoIP anyway.
I think a few of the ideas here might be seen as a bit too hardcore, but I think they reflect the level of realism in other aspects of PR at the moment, so it would seem pretty natural for it to be quite a harsh system.