[democrite]

I vote too for icearch's suggestion of TOC editing. I think there might be perhaps some mis-understanding. Perhaps for various reasons one might have any number of consecutive headings that need simultanous changing of heading level.

- his converting of something I forgot, creates a book with all H1.
- commercial EPUBs might have a flat TOC where section 1, 2, 3, etc. plus all chapters within each section or part are all H1 (maybe this is also exactly his issue)
- other times front matter might be all H2 under a H1 "Front matter".

In this case one can select any number of consecutively listed headings and merely drag and drop on top of another heading to make it one level below, or drag differently to move them up a level such as to H1. Keyboard controls for such I don't know if that'd work. Being able to select multiple conseutive bookmarks or TOC entries and drag somewhere to change level or position, that is how most PDF app TOC editors work. Acrobat, various others, maybe all PDF apps that support TOC editing work that way. So in that sense, I think that's what he's asking for.