offer rename prompt for antags on roundjoin/start

[Kotlol]

I don't feel like just giving a rename prompt would do much if you're actually trying to alter the character considering you'd still look the same. Unless you just wanted to change your name from Sally Smith to EVIL Sally Smith or whatever.

I wouldn't mind a 'random name if I roll antag' thing in character setup though.

You know aloe that wouldn't be a bad thing. You could make an option to load in a save file of another charater... or more importantly.
Give a random option of: "Random name and Random design" 

No one hates options after all :P