As to abrupt maneuver, EU limits rate of change for steering control and I think it would be wise for US to adopt something similar for driver assist systems.
Let’s not go down the rabbit hole of government specifying how machines we haven’t even built yet should work.
If evasive maneuver is required it would have to be done in fully autonomous way. For the time of the maneuver system would have to be responsible for driving.
That's a terrible idea. First it's a bandaid over an underlying problem. Second it's a legislative answer to a technical problem, which is IMHO never a good idea.
Above everything, the car's driver assist should not be making moves that human does not understand if system requires human to supervise it.