Add option to turn of touchscreen (or partially) while screen is on
So, the idea is to use the phone as a digital quick reference source. One can open a quick reference (cheatsheet), turn off touchscreen and turn on caffeine mode (screen always on). The reason why touchscreen-off option is needed is because I'd like to be able to slip my phone into my pocket but not messing up what's present on the screen. Even turning off, say, 90% of the touchscreen would probably do the job (leaving 10% for button/s to turn the screen back on or extras).
Given that one would probably have more than one cheatsheet, it would be nice to have an option to scroll through them quickly (perhaps again by not turning off the entire touch surface and adding some buttons on the sides).