There was a young guy in Las Terrenas who had his both legs amputated and drove around with the help of his friend in a normal Suzuki Jeep (I don't even know whether it had an automatic transmission...).
He would use a stick with a fork at its end to operate the pedals.
Check with Rocky (send a PM). He may be able to give you contact info for a customer of his who is a paraplegic and gets around Sosua pretty well. I can't seem to remember his name, I think he is an expat from one of the Scandinavian countries.