Right now, DNFing a book marks it off the book-specific challenges and makes it look like I have completed more than I actually have.

When you look to view more details, it marks the prompt as "complete (DNF)" and adds the DNFed book to the total of "read" books in the progress bar.

I would love if this were an optional thing you could set up while making the challenge. I love the book-specific challenges but I DNF a lot of books because it's the right book, wrong time kind of deal.