It has been requested before, but so far no addon developer has taken on the challenge.

Id love this.

Lets say the whole LOST collection... all the webisodes etc.

I think both of these would be great additions to rename by web feature. The API is open-source and provides better accuracy at least for tv shows (if properly filled in). As for themoviedb.com API they get there info from imdb but they also provide a collection listing (ie.. Rocky 1-6 should be automatically listed as Rocky Collection). And speaking of which that would be nice also for a file property is a section for Collections (listed underneath Series maybe).