I'm not asking for anything super fancy (although I can make up all those symbols using ALT codes just fine), I just want superscripts and subscripts. Some people may find superscripts less readable, but I think subscripts can at least make things more readable if used right. I mean, look at the facts around here - if you type up formulae in GML, the newbs are going to think you're giving them copy-paste code and then they'll flood the forums with, "This doesn't work, it's giving me errors!" or, "What do I put here?" And I guess in a way a font of size 1 could work in place of subscripts, but changing font sizes is a lot more tedious then just typing [sub][/sub] if you're used to just typing things out in one go.
Then you have the super newbs who don't even know sqr() and sqrt() are functions in GM. Hell, some people don't even know what max(), min(), median(), and mean() do. Granted they probably also wouldn't know that superscript 2 means square, but then again, there's always the possibility someone would know what superscript 2 means but not what sqr() means. So saying
d=sqrt(sqr(x1-x2)+sqr(y1-y2))
would mean a lot less to them than
d=√( (x1-x2)² + (y1-y2)² )
(Yes, I know the ascii codes exist for the superscripts, but those can only take you so far.)