Ok the bottle is scotch is in the mail, along with the Cubans.

Anything that chimes, flashes, honks, or SPEAKS.
Anything that attaches to the windshield with suction cups, to the dashboard with adhesive velcro strips, or to the exterior of the car with magnets.
Anything that requires me to run another wire to my positive battery terminal.

Uh, my V-1 attaches to the windshield with suction cups...

AND it can beep, flash & count (forward, backwards, and sideways).

I'll add some to milt's list:

For a winter car, heated door mirrors, seats, and etc. can be very handy.

For any car, a motor to squirt the windshield and to operate the wipers... sunroof motor, I could see elec. window motors even -- tho not on my Early 911.