I agree when that window slams shut, is startles you. I took that long drive to SUNI from the Orlando area & really needed the windows to stay open. I don't know what the "correct" fix is, but here is what I did...
I took a 1/4" plastic cable loop tie down & used one of the existing screws for the latch, then just looped a rubber-band around it. The rubber band (like you get with fresh Veggys) stays with the cable tie, so you can pop off the rubber band when you need to close the window. Corny, but it works....