Editing Long-Press of Android Buttons

[larkins]

Is there any way to edit what happens when long pressing the 3 Android buttons?

I want to have one of them switch off the screen when long-pressed.

[Tourbillon De La Vie]

Look for side button in Settings/advanced features 

[larkins]

This will bring buttons on the side of the screen right? What about Home, Back and Menu button long-press?

[Tourbillon De La Vie]

Not sure if there is an app that allows you mapping of those buttons. There might be.

Did you consider double tapping the screen to turn it off or adding a screen off action to One Hand Operation + app ?