Yes it's certainly a first draft!! :-) Thanks for trying it out.

With the disambig pages, can you suggest how to detect them?

Ah, there's a couple of other bugs here:

The page https://fr.wikisource.org/wiki/Accroupissements actually
already has a WIkidata ID, but the ws-search database didn't know about
it :-( probably because it was failing for a while on some weird
problems. I've re-run the scraper, and now that work is showing up with
it's proper Q-number:
https://tools.wmflabs.org/ws-search/?title=Accroupissements&author=&lang=fr

The idea with the quickstatements is that it'll only show it for works
that are *not yet* linked to wikidata. This is where the disambig
problem comes in, because there doesn't seem to be a simple way to
determine what's an edition and what's a work without resorting to
Wikidata. We could look at categories? Is it a truth universally
acknowledged that pages in the categories defined as
https://www.wikidata.org/wiki/Q15939659 are all disambiguation pages?
That could work...