Requesting ability to log in to AniDB, and sync watched episodes (similar to how the TraktTV plugin works)
Also would be awesome if it could include a hash matcher to track subgroups (on AniDB you can keep track of which subgroups you have, for example if you have "K-On!" and the files you have are from "Horriblesubs" subgroup, it would sync that to MyList. Ideally through hash matching the files) and sync them to your MyList.
This could possibly be paired with fetching general ratings from AniDB and displaying them alongside shows. (Similar to RottenTomatoes, IMDB, etc ratings)
Not sure if this is all out of the scope of the plugin, if it's meant specifically to be a metadata fetcher, but if so it would be cool to have a plugin to do these features.