Yes thats true.. I mentioned that in the other thread I think. Last thing on my mind right now, but if I were to do something. I'd come up with a solution that can be put into our driver door, saving wiring into going into each door (I have a 4 of a similar product to 530T but for years didn't feel like installing).
At least with my unit, you'll be able to trigger the sunroof as well when you do your windows ;-)