I don;t see whats wrong with not being a RPer. I am some of the times, other times I don\'t feel like being something I\'m not...
People should be allowed to talk how they want, no matter what its about (to an extent, no ToS violations, of course!)! The only real rule should be no 1337 speak. People that have bad english(which there a few, as we have already seen this early) will be exceptions though, mainly becasue you can still tell if they are trying to speak properly or are just being stupid.
That\'s my two cents, and I think it is the only thing that will actually work. It allows anyone to play, even powerlevelers, but still keeps the chat clean. Just having proper grammar should be enough...