I would like to see the participant's rating of a book on the challenge page the book was read for. Like, how there is the little image that indicates the book was reviewed? In addition to or instead of that, to show the rating of the book. 

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Just an idea! Thanks.  

And it's a great idea.  In fact it will be that way on the new site when it launches later in the new year.  We'll be using stars rather than numbers though.

Our update is more just a general plan to always show star ratings under the book covers wherever the book covers are displayed on the site rather than a purposeful upgrade for the RYO.  The idea is for consistency and ease of use because the stars will be live for rating that book yourself when you see it.  Also, I find that I always want to know what a book rates when I see the cover.