I see absolutely no need for a screensaver on a reader, personally. I always use a sleep cover on my reader, so it switches on when I open the cover, and off (or, more accurately, goes to sleep) when I close the cover. A blank screen (to indicate that the device is asleep) is absolutely fine with me.
Equally, I'm a little puzzled by the desire to see a summary of the book you're currently reading. If you're reading it, you don't need a summary, surely?
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