Probably already been brought up, but HT, have you considered not having a channel one in the coming mission based arena? You might kill two birds with one stone there. You'd give the players an organized mission arena and kill the sometimes childish channel 1 stuff.
This might help draw more pilots in there. With no channel one there'd be no taunting, smack, whining, etc. There'd be improved immersion. But you might have to disable private channel between non-countrymen to keep the nuts from causing trouble.
People would always have the MA for socializing and stuff.
So how about no comms between non-countrymen in the new arena?