You drive how you want. Most of the people you see driving through buildings and blowing through traffic lights are elderly people using 2 feet to drive.

One of the main reasons of using ONE foot is because when you panic, you instinctively tense up. If your other foot is on the floor, it isn't gonna be jamming on the brake while you're jamming the other on the gas. It happens. All. The. Time.

There's a reason you're taught to use one foot to alternate gas and brake. We're not driving Model T's anymore.