Reply to Holding a button to change the master clock

Is it possible to have a button that, when held down, sets the clock mode to Auto or Manual and sets a certain deck as the master, then when released, sets the clock mode back to internal? Just as a quick way of adjusting the master clock by large amounts without going for the keyboard.

I tried master clock mode using button/hold, set to 'auto', which works when you hold the button down, but it doesn't return to internal mode on release. I also tried with setting it to 'manual' which works, but then it changes the clock mode to 'auto' on release. Any ideas?