I had thought of the username thing had think it would be more than reasonable that for any user with a username matching (one of the few) keywords, they would not have access to the syntactic sugar. And as for vroom vs. vroomm, that "problem" already exists.

And I would have to disagree with your comment about MTV-method. Though in the grand scheme, I myself could careless whether or not I make typos; that's what perl -c is for.

--
perl -p -e "s/(?:\w);([st])/'\$1/mg"