Situation on my Mumble Server::

DayZ channel
Subchannel 1
Subchannel 2
Subchannel 3

3 Players each.

All have a broadcast button for important events.

It would help a lot if all communication starting with that broadcast button, would sound off a small sound effect, like a simple beep, so that everyone hearing it knows that it's a broadcast. Currently we do it the old fashioned way, so the person starting a broadcasts begins by saying "EVERYONE", or "TO ALL" really loud.