If Sam cannot adapt (re-learn to drive) with his feet the proper way, this seems the next best option. Personally, I can't get on board with driving with the left or both feet; it's an extreme safety hazard. Using both feet can wind up "riding the brake" & driving with the brake lights on (especially if the pedals can't be felt), cause undo wear on the brakes, and reduce safe control. When crossed over, the left foot can get caught under the brake pedal; better to get/use a left foot accelerator pedal.

Google: adaptive driving for some safer solutions

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