the most innovative solution I've seen for powering up a laptop involves using a bicycle brake handle and wire. Yes, that's right - a bicycle brake handle and wire. The person who did it hard mounted the handle upside-down in the dirver's side footwell. The wire from the handle was mounted directly over the power button of the laptop and everytime he stepped on the handle, the wire would depress the laptop power button.
Do a search here and you will see what I mean.