I also use the modified thumb and fore-finger method, a bit of both on the throttle, but mostly thumb, but push and pull on the throttle and rudder rather than sort of gimble it around with my thumb.

On the elevator and aileron, though, it's pinched between my thumb and forefinger and held that way. I seem to get the best control that way. My instructor wanted me to use the pinch method for both, but I just could not get comfortable with that method on the throttle, but it seems very natural for the right stick.

CGr.