Yesss now I can play osu and everyone can hear my loud spam clicking on the notes. Honestly, it's not a bad idea to put that specific channel for the game, but I also don't see why you also couldn't just use another channel as well, I don't really believe it specifically has to say "osu" for you to play osu with friends. But again, it's not the worst idea; because people could be playing in the Teamspeak channel, and some other players might notice and come join as well, knowing you guys are playing osu.