At the risk of thinking up a "Homer Car" I think schoolbus-style sticks should be an option along with a number of other things.
Five-point seatbelts -- they hold you in better and are easy to get out of. Yeah, most people would hate them but they'd do wonders for safety unlike the infamous "decapitator" automated belts of the early 90s. Too bad no one would wear these, either.
Coolant Thermos Bottle -- five or so years ago I read an article that someone had come up with an insulated coolant resevoir bottle. In the winter time, your car was instantly warm in the morning (enough to kick on the heater) and there was no wait time. They said it would be an option in a number of years, but it never happened! When I lived in a place that actually had a winter, I couldn't wait for this innovation to become a reality.
A/C Condensation Collector -- you know all that water that drips off the A/C? That stuff should be collected, filtered, and made available to the passengers. On hot days, there wouldn't be anything better than the cool, refreshing taste of AC drippings.
Radio Station Info Display -- Landrover is the only company I know that has implemented this in vehicles sold in the US. The radio station you tune to sends out its station ID, music genre, etc, in a digital format. In Europe, practically all car radios for the past ten years or more understand this data and will even display traffic accident information. Want to listen to jazz? The radio will find a jazz station for you. Radio station starting to fade out as you drive away from it? If the station has a networked twin, the radio will tune to it.
