RS,
I read that the Air Force added computer directed throttle/speed control to their stealth fighters. Perhaps you could tie a cruise control system into your stuff to reduce the probability of arriving early or late to near zero. Of course that would mean you'd have to upgrade your clocks to read in nano seconds.
Thor,
Not much electronics in my car. When I built my wiring harness, I included an accessory circuit that is hot when the master power switch is on. I added a 12v outlet to that circuit (hidden under the dash) to power my smart phone (i.e., music, GPS).