I love the idea about the clock-based stats! Pages/min for each book or overall. Estimates of how long the next chapter will take, so you can decide whether to call it quits or start the next chapter. You could even have a "time remaining estimate"! That would be a really extraneous feature, but if it was simple and seamless it would be a lot of fun. And you can't do that on a paper book! ;-)
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