I have had two memorable occasions where the seat belt pulled me back into my seat, the brakes engaged, and I was not in an accident. I wonder whether I could say the last of the three things if not for the PCS. Are you asking to completely disable the system? In my car the ACC (or DRCC) isn't engaged until I turn on the cruise, set a speed, and then also choose the distance separation. I can set the cruise control without engaging the radar-set separation, but I don't understand why I would do so.