PRICES GO UP AT THE GATE
Sure, I get it, it would be nice to have it integrated here in one place, but personally, I wouldn't hold my breath waiting for them to add functionality here. They used to have watchlist and favorites lists, but they got rid of being able to manage lists several years ago. This is one of the reasons for this "partnership" announcement a couple years back:
The new affiliate partnership with Crunchyroll brings with it a host of new exciting features, including allow users to list, rate, review, and even watch Crunchyroll’s thousands of legal streaming videos directly from Anime-Planet. Perhaps best of all, Anime-Planet’s recommendations now make it even easier to find out what to watch next on Crunchyroll.
There are other sites which have similar functionality as well, such as myanimelist.net, etc.
Extended tags,ratings,show discovery: http://crunchyroll.com/group/rotten_sushi