Late joining antagonist toggle

[Grek]

Or if you would like to be a traitor, but only if you're there at roundstart. I know that I personally don't enjoy becoming a traitor/vampire/ling/blob/wizard with 3 minutes left on the shuttle clock. It doesn't matter that its not hurting my odds of being an antag later, I just dislike playing special roles without having a little while to listen to the station and decide what I'm going to do.