The switch is not normally any different the one touch function is from a small timer normally positioned in the door.
I have converted my sapphy to one touch on all windows, as well as me mondeo to one touch all doors.
I use the timer modules found in the top corner of the drivers door, held by two screws.
See if you have this system, as I am not aware of any other, if you have this system, I'll post up the simple wiring needed to each door, you can also add one touch up(sounds nice!!) to the doors if wished, I haven't bothered myself.
tabetha