Would love a way to set specific tags to challenge prompts so that books read with that tag added will automatically add themselves to that prompt. This could be specifically helpful with large challenges like reading a book from every country. A participant could effectively tag each prompt. Putting it on the participant would also make sure people have full control over how their tags are set up and if they want to use the auto system on each challenge.

Often I find myself realizing that I have already completed a few prompts only when I check my tags.