Is this thread still alive?
Anyway, I also like this idea. Maybe you were right, but the 'point' tab doesn't show our given rating right away. We still have to go to the story page to see our rating for story.
Actually, I prefer it to be called 'finished story' or 'bookshelf' tab, so it would include the unrated story as well, since I rarely gives a rating for the story right away when I just finished one playthrough. Nevertheless, this feature, especially if it has sorting feature (e.g. sort by rating, sort by title, sort by author, etc.) would help the player in case they want to replay the story in future. Because, replayability is one of the main perk of cyoa story, isn't it?