I love the sound of the Reject List feature and how it will work. Great idea!
And since we can add our own remarks on the stories all the better. I know there are some stories that I have in my library which I've given low star ratings, but I haven't removed them because I like a bunch of other stories by that author and I don't want to keep downloading it. Being able to remove a story from one's library AND make a note on why it's not a keeper (or something you should bother downloading again) would be incredibly useful.