My phone is always on silent anyway, so I'm not bothered by that..

But maybe to get past that, can we have two button presses at the same time? Like I said before - press volume up and down together to take screenshot. Or Press up and then down in rapid succession, so if your phone was in silent, it'll go to beep, then back to silent again and there will be no change. Is it possible to detect that by the button monitor?