Doug, it can be done with an oem switch, but the functionality will be a little "funky".
I call it "funky" because the only way to open the window would be in the express mode. So if you only want to crack the window open, instead of opening it all the way, you have to get creative. You would rock the switch into the down position, and the window would take off in the express mode to open all the way, then to stop the window at an intermediate position, you would rock the switch momentarily in the up position. Another method to partially open the window would be to allow the window to go full open, and then close it manually until it is only cracked open as far as you want it.
To do this you will need two "double pole single throw" relays and one micro switch per window. I think. He, he, he ....
Your friend on the DTBB
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