One legged drivers...
...should be allowed to use automatic transmissions. They can have a waiver on their driver's licenses. Everyone else should have to learn to shift gears, just to demonstrate a basic understanding of the operation of an automobile.
When you rent a small sailboat at the beach, you have to demonstrate your basic skills by rigging it yourself. If you can't do that, you have no business being out on the water. But if you rent a 300 HP powerboat you sign a paper and they hand you the keys.