BMWs have that, dont know how it works though you could look up the wiring diagrams from one to see.
One thing I would be worried about is the one touch close without a sensor to pickup if it is squishing anything that is hanging out at the time ie. fingers, hands, head, etc. The newer Audis have one touch windows that will reverse if it sences anything. Maybe you should look into that too.
lol a one touch close could be kinda deadly, could take someones head off lol but then again, my drivers side door has that auto-reverse feature maybe you can somehow incorporate that into the wiring, i dont know...
anyways, so how about just a one touch open? any ideas? thanks.