Talk about over-engineering things...
Heels on the rudder, toes on the brakes; need to brake pronto? Don't waste a little extra time you can gain by
attempting to move your toes to the brake pedals. Be as ready as you can be for any outcome.
Don't need to brake? Don't step on the bloody brakes! It's really not that hard
Not once I've been told to remove my heels off the pedals and not once I have had any type of scare because of that. But I've been mighty glad, though, that I have been able to brake just at the moment I wanted to and not wasted time and effort trying to move/slide/whatever my feet to the brake pedals.
Don't over-complicate really simple issues. Please