I think it would be pretty cool to make a bank of 3 position switches that are wired such that they need to be in a certain configuration before the car will start. But you'd still ultimately only have one wire in, and one wire out...I had started to work with my cousin who's going to school for engineering on rigging up an NES controller with some kind of electric lock so that you'd type in a certain button combination ( up, up, down, down, left, right, left, right, b, a, select, start for instance) to either open the door or start the car. I think there's a market for it, but we never got anywhere. It's probably not even that hard to do, but we never went past the talking about it phase.