That's exactly what the Sony Reader does, of course. The downside is that, for a long book, there's a delay of about a minute when you first open the book, and when you first select a different font size. Given that the current way the Gen3 works appears to be the way that ALL versions of the Mobi reader get page numbers, I'd guess that this is code (or at least, algorithm) supplied by Mobi rather than anything that Bookeen have done themselves.
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