I just got out of the sim (747 Classic) this AM with a warmup session for my PC scheduled tomorrow. When it got to the point where I expected a rejected takeoff, I actually thought back to this discussion.
The sim has autobrakes (not all our airplanes have Takeoff Autobrakes, though). The scenario is what I consider to be the most difficult -- high-speed reject when the F/O is making the T/O. Our procedure has the Captain on the brakes & throttles until V1, and the F/O on the controls. Also, I am expected to override the autobrakes by using maximum manual braking.
I consciously put my heels (attached to size 11 feet in soft-soled shoes) on the floor. At 120+ KIAS (V1 was 149) we lost an outboard engine. I had no problem applying the brakes and steering with the pedals; I slid my feet up the pedals without thinking about it, and my toes stopped at the top bars of the brake pedals. Even with an autospoiler failure (reach over and manually deploy the spoilers before going to reverse) the procedure went without problem.
FWIW, I fly landings with the balls of my feet on the bottom of the rudder pedals and my heels consciously lifted off the floor. I think this gives me better ruddr feel and control for crosswind corrections. Once I confirm deceleration via autobrakes after touchdown, I continue to "fly" the rudder pedals until it's time to slide my feet up to tap the brakes to disengage the autobrakes, and then brake manually.
As for the TSB excerpt above, I don't know what may have "prevented repositioning" of the pilot's feet. Our pedals are quite smooth after many years of wear, so sliding my feet up the pedals -- even with soft, rubber-soled shoes -- is not a problem. I have the strength and reach to put both pedals full down even if my toes catch below the top bar of the brake pedal, though I feel I have better control if my toes are "wrapped around the bar with the balls of me feet just below it.