I'm not quite "proper." I never use right Shift, my left hand sometimes reaches across to hit keys my right hand is supposed to hit, and I use my right ring finger for any key above the home row your pinky is supposed to hit (P, brackets, backspace, + -, etc).
I can still hit 120 wpm on a good day though.
I don't get 120 wpm though. The best I've seen on a typing test is around 90, and I seem to average 80 if I'm concentrating. Never have to look at the keys though.