Rob, positive and quick responses, thank you.

For Acorn#04, this is generally for searching down a problem object or alignment issues. It could be useful for documenting websites in PDF layer reveals.
For Acorn#11, the Name is set insides a pair of empty SPANs when it is added to the complete text area either a Select > Name or Text tool > Select All > Name. If a word is highlighted and a Name added, it works correctly.
For Acorn#18, create an index page and add another with '%' in the filename and simply Preview this second page --> Big red cross pop-up.
For Acorn#22, yep .epub would work as I think that is effectively a wrapper of content.
For Acorn#24, a concordance list of every word and its locations by page in the entire site.

Many thanks,
Acorn