I used to fly thumbs only, until I got G2 and started attempting knife edge flying. I found that I kept holding the rudder input and not releasing the stick to center, primarily because you really need to manage the throttle a lot in the KE. Since the throttle doesn't center I found that I had a hard time feeling where the center was on the left stick with only my left thumb on it. Needless to say I biffed quite a few virtual planes and almost lost a real plane by making the same mistake.

I got so frustrated one night that I layed the TX on the table while flying G2 and what do you know, I can feel the center better and the feel of precision is MUCH better "to me". I liked it so much I bought a Petal RC tray and now I feel naked when I fly without it.

It takes some getting used to but my nod goes to the fingers and the thumb, in this case MORE is better, at least it was for me.