[EricH]

Originally Posted by The Analog

how about 2 gas pedals, one for the left wheels, and one for the right, then you have a tank drive, it might require some major changes to the golf carts drive train

Take away the "might" in that. Is it doable? Yes, but not easily. (Golf carts use steering like cars; modding that would need a second motor and locking the front wheels at minimum, let alone control setup.)

Depending on the user's ability, and on the golf cart's steering column/body surrounding the steering column, I would actually go with putting a second steering wheel onto that rod at foot level, if at all possible. It's simple, it doesn't affect usability if he wants to be driven instead of do the driving, and it may actually be pretty cheap.