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To keep someone from driving off with your car:
Unhook the ignition key switch and reroute to another horn. Use your cigarette lighter gizmo as your starter switch.
Remove battery. Or, if you are worried about someone stealing just the battery, strap it down with steel strap. You could use some of the stuff used in the shipping industry.
Hook a micro switch up under the shifter boot so that you have to be in 4th gear to start the car. This only works for manual transmissions.
Memorize how your distributor wires go and "rewire" them before you leave. Or take your rotor or distributor cap or the wires. Or make a bad wire that goes from the coil to the distributor.
Unhook carburetor fuel solenoid wire and hook to another random wire that does nothing.
Make an exhaust butterfly valve that can be closed from a lever under the seat. Make it so the engine can't start or so the engine can't go above idle. Imagine the thief puttering down the road after spending all that time to get the car running and then learning how to slowly let the clutch out.
"Fix" an old air filter so that it won't let air through, replace before driving. That would stall someone for a little while.
Add manual fuel cutoff valve somewhere in the trunk, or find a good, easy way to replace your good fuel filter with a bad one before you leave.
Never keep very much gas in your tank. Take your full jerrycan with you when you leave.
To keep car from being moved:
Add valve in brake line. Push brake and close the valve. That might be bad if your brakes leak though... The same could idea be also used for a hydraulic clutch actuator.
Add an extra button that must be pushed (preferably under the rubber boot) to release the parking brake.
Some of this is impractical, especially on newer vehicles. It would be effective, though.
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