Yeah, since the day I got my bike, I have only used two fingers on the brake lever. This was for two reasons: 1) I didn't want to grab too much brake in an emergency stop and 2) I want to get some aftermarket levers, and using only two fingers would build muscle memory for when I get some shorter levers.
Two fingers is more than enough. "That's what she said!" :rof:
That's interesting, because in my M/C safety course they taught to grab the front brake as hard as we could, in conjunction with the rear brake, on the quick stop stuff...