> index items should be linked to the place in the text,
> and a backlink should be made as well, if at all possible

A backlink from where? And why? I think we should use links
only where they are explicit or at least loudly implicit in
the original work.

I do understand this one. If I can click the index number in the text to take me to the index entry, I then want to click something on the index entry that will take me back to the same place in the text. Ditto footnotes and endnotes, which I now do by inserting them at the end of the appropriate paragraph and double-indenting them.

 

Anne