yes, this "shade closed loop" thing works pretty good, so why would you ever want to switch it on and off if you don't have EXACTLY the problem i am having : ) Ironically I am quite glad this button there!
I am going make a mapkey for that button and see how the workflow is. If it is too annoying, i'll do what you recomand. i just need to find out what maintenance contract my university has with PTC.