Well that would ruin it, then.

My suggestion wasn't that you actually use in-game voice chat for comms. It's that everyone has a bubble over their head because they are technically transmitting. I know they use Mumble for actual comms, that's kind of the whole point.

And sv_alltalk is disabled and that's fine. You're not relying on the spy to talk and give himself up. You're relying on all your teammates to have voice chat bubbles over their heads.

I had a crazy idea. Spies cannot use in-game voice chat to communicate with the other team, so anyone with a voice chat bubble over their head is not a spy. What if, through some sort of config, a whole team had their push-to-talk buttons "pushed" but their mics were muted? Spies would be instantly obvious, as the only ones without bubbles over their head.

Is this currently a banned strategy? I don't see rules against it in UGC. Is it cheap? Yes. Should it be banned? Yes. It's just an interesting idea I came up with.

I'd like to hear your thoughts.

Edit: Yay typo in the title. That's what I get for typing on my phone.