Allow to lock controls.

[visayanaryan]

I use this application as a light box to copy paper drawings using my tablet's display (pretty weird huh). Currently it's easy to trigger something on screen with hand and I wonder can you add this simple feature (a lock button to lock screen controls like VLC media player does). You can then unlock control by triggering "back" action few times or something. I know this is far beyond original app purpose, but I can say this also can be applicable when using it as intended, sometimes you need this to prevent accidental interactions (using flashlight in small spaces and etc). Feel free to close this as not planned

[elastic-rock]

I like the idea. I will add the feature once I have a bit of time. :)