Personally, I use NickelMenu to toggle screenshots off/on, normally leaving them off.
My Kobos live in sleepcovers so I don't use the power button for sleep. OTOH, my Sage does not have easy access to the power button which makes taking a screenshot a bit of a pain while my other Kobos do have power buttons that are accessible while the sleep cover is on.
A simple one line item in my NickelMenu config file which toggles the screenshot setting off/on:
Code:
menu_item : main : Screenshots : nickel_setting : toggle : screenshots