These are all good features... things I'd like to do, but of course I don't want to do any of them halfway, so if you don't see 'em in the next release, it's not because I didn't like the idea, it's just because there were probably hidden implications that made the idea not feasible right now.
Submitting data back to Amazon is a little tricky right now -- the APIs we use don't support it, so we'd have to screen-scrape HTML, which is possible but not pretty. We're still waiting on them to provide us with XML APIs to things which require people to log in -- they feel this is a security issue, we do not.