[KevinH]

FWIW, because the ncx and nav are built from heading tags h1, h2, etc, it effectively does copy h1 tags into the title. It just does that after the epub content chapters are set, not during. Building a TOC from the headings is trivial in Sigil using the Create TOC.

In fact, because of joining and splitting files, I tend to always leave the title tag empty until after the epub files and content have been determined and a ncx or nav exists because Access-Aide will not overwrite existing title tags, just fill in empty tags.