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Out of curiosity where did you get the idea that a Kobo would take a screenshot by touching opposite corners?
That aside, to enable screenshots on a Kobo ereader, you need to edit the Kobo eReader.conf file found in the Kobo directory inside the .kobo directory. Locate the [FeatureSettings] heading and add a line reading Screenshots=true under it.
Your Kobo will now take a screenshot when you tap the power button.
My personal preference is to use NickelMenu to enable/disable screenshots since when screenshots are enabled, the power button can not be used to wake the Kobo from sleep which is a pain when you do not use a sleep cover.
Screenshots=true
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