Well I must warn you if you use too bright of led's you could hog too many amps and burn the fuse to the controllers(they share one fuse). I'm not too sure how much it can handle but just be (:x) weary.
Anyhow the pinout you found is one of the best on the net. PS2 and PS1 controllers are the same pinout(hence the ps2 controllers are backwards compatable).
So whatever the +5 Line is on there(most likely going to the rumble motors on the control board) and use the proper resistor for the LED/LED's you buy or whatever. Oh and you might need a hole
or you wont be able to see your new led too well.