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The GM EV1 had this solved early on: they didn't use keys at all - just a numeric PIN that you entered on the door and on the center console to start. ;)

http://www.kingoftheroad.net/charge_across_america/graphics_...

Slap your PIN in and hit the RUN button and it'd fire right up.

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I believe Ford has a patent on keypad entry. Many of their vehicles have it.

I love the keypad on my F150 I seriously wish all vehicles had it.

It used to be that the PIN logic was just a simple rolling buffer and substring(ish) search, such that for a 6 button keypad, an optimized 80ish button sequence would open every single vehicle with those keypads.

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