Support Plex webhooks to enable immediate searches for recently added / recently watched / up-next
One of the features I love on Sub Zero is that recently added content get scanned immediately as it's added. Also, if you're watching an episode, you can configure it to scan for that current episode and the next episode.
I think Plex webhooks might make this easy to implement using the 'library.new' and 'media.play' events. I'm not sure how Bazarr stores its metadata, but the webhook carries some metadata payload that could be used to match against the Bazarr store.