well RMF thats not a good idea. If a clan would like to cheat that way it would just set up another mumble server for cheating purposes only
and not all clans will use voip clients like mumble. and additionaly there are teamspeak and other voip systems to, which would need a viewer.
Its never controlable which ways of communications a clan has, so we need to control the only part that is controlable on our side and that is the server.