1) Use two motors per headlight. One to control the up-down movement (speed) and the other to control left-right movement (turning). Connect a set of two springs to the headlight mechanism to oppose motion in the up-down and left-right direction that would allow the headlight to return to its original postition if the motors failed.
3) Instead of using fingerprint technology, which would be wicked cool, use keyless entry. But instead of the conventional system, have a device that puts out a intermitent signal all the time. The device would only be effective up to a few feet radius around the car. The receiver (in the car) would receive the signal and unlock the doors for you. No need to pull the keys out of your pocket. The receiver would also enable the ignition so the driver would get into the vehicle and push a button for the starter.