@slowsmile:
As Hitch has already pointed out, your idea that the use of headings, as opposed to paragraph styles, creates problems, is plainly wrong. I.e., by using presentational markup instead of semantic markup you're not only shooting yourself in the foot you're also not following best practices.
Quote:
Originally Posted by slowsmile
The majority of ebooks out there are epub 2. And would you really expect an indie author to know how to manually and safely format his toc.nx or content.opf?
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It's certainly true that most devices and apps only support epub2, but you can easily create epub2 compatible epub3 books with Sigil that compile fine with KindleGen. Since Sigil allows you to generate an NCX file from a NAV document, it also fairly easy to manually update the TOC. (Unlike the NCX file, the NAV document is a simple HTML file with list items.)
However, it's much easier to use the GUI for this.