I didn't have time to implement this to version 1.4.0 which has been submitted to store. Good news is that I've already implemented it for the next version.

I also found out about how to set stand-by screen on and off. But I'm feeling it's a bit too esoteric feature to support directly in UI (it starts to be crowded with the actions already). But it is extremely easy to do by command-line. So I will implement to next version executing command-line applications, and you can then easily create rules yourself that switch it on and off (and many other uses also). Does that sound reasonable?