This morning, I left a short review on a story, then thought of loads more I wanted to say. It isn't possible to edit the review, or delete and replace it (only report it for abuse, which I don't want to do since it isn't abusive), and since the story is a one shot I can't leave a second review.

As well as thinking of extra things to say, you might want to edit a review if you'd notice a mistype, or felt that you needed to explain what you'd written more fully, especially with constructive criticism.