I typed more than twice as fast as anyone else in my computers class last year, so my teacher just let me do what I wanted during typing exercises. XD That was the standard optional computing class, but now it's split a little so students are expected to type reasonably well.
If I type now and observe which fingers I use, I rarely stray from the index and middle fingers, but I use the ring finger for some letters, thumb(s) for space, ring finger and sometimes little finger for shift. Right hand ring finger for enter, backspace, and other keys in that area. At rest, if I'm in the middle of typing, my fingers naturally lie near, if not on F and J, but I don't specifically feel for them. If not, then my left hand hand fingers lie in about the same places while my right hand fingers go for the arrow keys. Stupid Runescape.
No point trying to change how I type now anyway. I'd imagine it would be difficult to adapt, and you can't argue with 90-100 WPM on average.

(at least when the teachers can only do <40)