CoolReader doesn't make a difference between cover and power button (AFAIK, PW has a way to find out if it was cover or a power button, but PW2 doesn't).
It just gets the even that screensaver is active/inactive and handles it:
https://github.com/CrazyCoder/coolre...indow.cpp#L141 .
I don't think an option to disable handling of the power button makes sense for most of the users.