If the passenger seat of your car had a foot brake so the passenger could decide when to brake while you were driving, would that make your driving safer? Cars

If the passenger seat of your car had a foot brake so the passenger could decide when to brake while you were driving, would that make your driving safer? Cars already ignore driver braking input when it would be dangerous - that's what ABS is, after all, selective releasing of the brakes on locked wheels. I can think of plenty of circumstances where a passenger just slamming on the brakes could put a self driving car in more danger. Still, no reason not to have a 'pull cord in case of emergency' type brake for passengers to use to signal the car to stop as soon as can be safely managed.