[David]

Since the rules don't allow suspension changes when moving and the steering wheel can only be used to steer the car, I surmise that pulling the wheel back only 'steers' the wheels towards each other so they're perfectly straight. Then pushing the steering wheel in 'steers' the wheels out (more toe out) for better turn in. Any change in camber would only be a side benefit that occurs when the wheels are steered anyway. Simple idea with probably a very complicated solution.