If anyone came up with a way to leave last page of book as screensaver on non-touch Kindles, let me know. It's possible in two ways neither of which is appealing to me:
ssknap or deleting /opt/amazon/screen_saver images!
Also, I like my new sleep time as 5 minutes. You can change it too: t1_timeout: 300 in /etc/powerd.conf.n -> It's original value is 1200 seconds.
Be careful!