You're confusing the file format with the reading system.
All the books on Feedbooks are 100% ePub compliant, it's the reading system (Digital Editions) that decided to limit the size of the flows, not the official specs. For Proust, this would mean, adding a page break in the middle of the text where there should be none. That's why, although I've decided to use multiple flows, I'm not ADDING page breaks simply for DE yet. Those same files work with Stanza and FBReader.
Left and right margins can be specified in the file, I don't see how this is connected to either ePub or DE.
The size of the small font is a decision from Adobe/Sony.
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