I am particularly interest in this because my granddaughter is in this program, she is blind and probably has Cerebral Palsy. She wears eyeglass frames to stop her rubbing her eyes, something that blind children tend to do and that can leave permanent darkened rings around the eyes. In this, they moved the accelerator to behind her head so she would keep her head up. She is in the picture below the video as well as being in it.
http://www.huffingtonpost.com/2014/02/24/toy-store_n_4847954.html
Whether this is engineering, design or something else, it is worthwhile.