I really like the new "Select Similar" feature. The ability to select all tracks in a album or with the same comment is very useful.
One enhancement that would help me would be the ability to select similar in bulk. For example, I select all tracks in a "Greatest Hits" album then resort by track title. Those tracks are still selected but are not lined up next to all other tracks with the same title. The ability to "Select Similar" and have all the tracks with the same track title as the ones selected would be very useful.
I could then invert the selection and remove the other files, showing me roughly the songs on that Greatest Hits album that are duplicated in a standard album. Or I could drag those files to MusicBrainz Picard to update the album metadata, etc.