In CS5.5 there's a workaround you can use to force ID to split the doc (at export, into multiple XHTML files, thus creating a real page break) at any given point, even if there's no paragraph style there (the style you choose in the Export to EPUB Options dialog box).
The trick is to anchor a small, white-filled frame (no border) as an inline object in an empty paragraph right *before* where you want the page to break:
Last line of text in previous section/chapter.
[anchor graphic here in its own paragraph]
New Chapter or section starts here
Then select the placeholder graphic with the Selection tool and go to Object > Object Export Options (new in CS5.5). Turn on Custom Rasterization in the EPUB/HTML panel so the object gets included in the output and rasterized. (Since it's white you shouldn't see it.) In that same dialog box, turn on Insert Page Break: After Image.
Now you can copy/paste that paragraph with the graphic to any other spot you want a page break.
You want to paste it *before* the page break because otherwise you end up with extra white space above the first line of text in the new chapter.
I didn't get a chance to include this cool tip in my Lynda.com video (the InDesign CS5.5 to EPUB one just came out) but will be writing it up at some point on indesignsecrets.com.
AM Concepcion
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