Is this possible? Overlay style as main layout

[FatherPrax]

I am quite often in large mumble chats outside of a game, and trying to notice which of 20 - 30 people are talking in the large list of people is quite annoying. I'd rather have a video similar to the Overlay where the people who are talking are the only ones shown.

[jidea8]

[FatherPrax]

Yes, but that is in the overlay. If I'm not in a game, I can't use the overlay as far as I know. I have to use the full client. If there's a way to force it into the overlay just on my desktop that's fine.