Actually, we are speaking about slightly different things (although I'm sure there's plenty of overlap).
There's a definite OOC need for that; there's an IC need, but I worry about being able to play "nasty" characters if it is too strict.
What I'm actually referring to are things like:
(IC):
"I'M GONNA !@#$ YOUR WHORE MOTHER"
(OOC):
"Well !@#$ your pussy prima donna ways. I'm gonna keep !@#$ing saying that !@#$ all I want to."
