On AutoDrive Teslas, the pushbutton at the end of the cruise control stalk served to turn on/off the cruise control in v6. With v7.0, it seems to do nothing. Suppose Tesla let the owner select a function to assign. What choices would you like on that list? Remember, this is an option for one of the controls that you can find with tactile means without taking your eyes off the road (as those touchscreen buttons require). Ignore the next exit lane markings (in Auto-Steer). ?