Adjustable lane tracking on AP. Sometimes, you don't want to be tracking in the middle of the lane. For example, when you live in a State with legal lane-splitting motorcycles. You want to be a little to one side or the other. Or, when it's pot-hole season, you don't want to be tracking exactly where the potholes have formed, you want to be just a little to one side or the other. Or, you're driving in the left outer lane, and you're behind an SUV, by shifting a little to the left, you have visibility to the vehicles ahead, just like radar being able to see past vehicles in front of you.
Having a way to allow the car to shift 6" to a foot left or right within the lane would be helpful in all the situations above. I typically drive in an outer lane, either left or right. That gives me a bailout lane on the shoulder of the highway, one way or the other. Because of that, i tend to drive closer to the shoulder. Having AP track right down the middle has required an adjustment in the way I drive. Having it be adjustable 6" to a foot, would solve that.