For latest versions of koreader, you have menu settings for sleep, and for power off, as Frenzie already mentioned, you need to edit settings.reader.lua manually, adding this:
Quote:
"poweroff_screensaver_type" = "random_image" or "message", "cover", "bookstatus", "readingprogress", "disable",
"poweroff_screensaver_dir" = "path to same as screensaver_dir or alternate dir for poweroff image(s)",
"poweroff_screensaver_message" = "message to use instead of Powered off",
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Watch for syntax, best practice is to backup settings.reader.lua file before any edit, if not, you can loose all settings.
As old code doesn't work for you, it seems you're with newer version, for older version this code would work. Personally I'm still with older version where this code works, but with time I'll switch to newer version where this code should work like charm.
At the moment with newer version you can't have image and text, only one or other.