Playing a Molly while we have these lingual limitations is difficult.
Haha.
As a rule, though, if I have to use language, I only use language that is actually found in the game - and even then, barely. People are very quick to jump on the sanction-wagon about language, even if the NPCs use it, or even a character in the campaign.
It might open up some interesting parts of RP if we could swear, but that bonus would be negligible when compared with the havoc and destruction that it would wreak elsewhere, with OORP players and people who insult out of RP.