I've added the suggested configuration settings to optionally use the highest possible quality for cover art as well as a setting for YEAR format and whether albums and tracks are included in the search results.
On macOS, the tag source now also shows cover thumbnails for the search results.
Your second idea to import track details is currently not possible. This would require one additional request per track to the Bandcamp website, because the track details are on the respective track page. Mp3tag can only perform one request to get the details of an album.
I'm also adding this to the initial post now, to make it easier for new users to get the latest version of the tag source. Also, the changelog should give some details on what's added and fixed.
bandcamp-0.4.2.zip (4.5 KB)