Maybe make the game recognized by xfire. This might get c2 a bit more out there.
I don't use xfire and also not really familiar with it but what i can read on their FAQ page is that if you want a game added to xfire you need to post something in their forum.
So maybe you could do that and for the time being I wonder who uses xfire?
Yup it seems that the developers of XFire are responsible for simply adding a game.
Extended features like server(room) creation and direct join of a server(room) would require some kind of API for the Cultris client. Would be a nice idea, though.
Honestly I don't think many people use xfire anymore, it just came to my mind since I still use it(be online and thats it).