You can do it with a 2002 or older switch, but not 03+. Because the 03 switches don't actually switch voltage. They send a data signal to the computer and then the computer actually rolls the windows up.
Iv seen 03+ trucks that use it like that i heard somewhere you need resitors an relays but Im not 100% sure on that....... why wouldent it work if you had the connector for the rear 2switches an used the wires to power the valves???