It would be great if it was possible to have a button or simple process to turn a tag into a book-specific challenge. I have a tag that I use to track which books I'd like to put on my list for the next year. When the book-specific challenges came out I started making it a challenge - which has been great! - but it's a bit of work to set up and since I already have the tag, I'd love an easy way to just turn the tag into a challenge.