Not exactly what you asked, but you can also "grab" the input device in your app, so that Nickel no longer has access to touch events. I used it in a specific case where I wanted to run an app without exiting nickel, which was still running in the background :
Similar issue:
https://stackoverflow.com/questions/...ting-on-screen
The Python code I used back then:
https://github.com/Mavireck/Kobo-Inp...r/grabInput.py
(Remember Nickel is still running, and can update things on the screen, like the clock, or make the device go to sleep).