Goto the config screen. Click the Importer Settings tab. Click the "Movie Details Data Sources" button. You can use the toolbar to add new or update existing scripts.
The current script should still work fine (recently also had a cover grabber added ) and i'm currently testing a new dataprovider (using the special API) for moviemeter.nl. I don't think you would notice much differences between the scraper and the dataprovider. However it should improve the time it takes to get movie information and it can lookup movies using imdb id. I can't give you an exact ETA because there's a lot of other stuff that needs to be done first
It would even be more awesome if the scraper would get the summary (in Dutch) from Moviemeter.nl and the rest of the film info (rating/votes/stars/plotline/actors/runtime/etc.) from imdb.com