[feature request] buttons to increase / decrease off timer

[Piramidowy]

Is it possible to add buttons ("+", "-") to increase / decrease off timer? It would be easier to use them that toggling between off-1-2-3-4-5-6-7h-off...

[insajd]

I agree that it's more convenient to have + and - for setting this up when controlling on computer browser.
This does decrease the touch area quite a bit though and makes UI a little more complicated for usage on tablet (Timer and 51m would not be touchable then).

I'll think about it, or somebody else welcome to make PR with a good solution. I would actually prefer configurable option to have + - or toggle button like it is now.