I'd love to see a way to combine tags with book format in the Stats section.
What I'm hoping for: the ability to filter or break down my read books by tag and format (hardcover, paperback, ebook, audiobook, etc.) at the same time.
Example use case: I use a "library" tag for books I borrow from my library. I'd like to see how many of those library books I read as paperbacks, ebooks, audiobooks, and so on. Right now I can see format stats and I can see tagged books, but I can't see the two together.
Why it would help: it would show how readers actually use their libraries. For example, whether someone borrows mostly ebooks and audiobooks through Libby (the library's free borrowing app) or checks out print copies. It would work for any custom tag too, such as "gifted," "bought secondhand," or "review copy."