Frank says it's under development so they haven't finalized anything yet. Luke says he always used the d-pad to talk anyways.
Maybe Luke or Frank will browse this board, see that we're not the typical Internet fucktards (just fucktards of a different sort), and actually consider our suggestions.
I had a problem with it at first, but now I've grown accustomed to it. I don't and never did communicate when in immediate combat. Maybe they'll have an option for team chat only rather than proximity voice/team chat with button press...I don't know. I care little about that feature now.