It's pretty annoying when you are trying to tell your team important stuff, only to have some idiot shout down the mic over you. So when the comm speaks, all other players should have their volume reduced to a certain amount so you can hear what the comm is irrespective of what other people are saying.
I agree with OP. Games with 50+ players are a shitstorm of communication, having the comm be able to talk over them is a good idea.
That's called Krazers law. If you were to suggest a cannon that shot flying monkeys you can garuantee that it would be implemented. But for something like this...