Can we have MathJax rendering?
It's how StackExchange and a bunch of other places render TeX mathematics formulas.
At least over in D&D there are times (like our current [Science!] thread) when it would be really really great to be able to show a properly formed equations and not try to make it work with regular characters.
MathJax is entirely clientside, so the only thing needed is to let the forums load it and set a configuration parameter for the types of text it should recognize.