Regarding the date thing, I would rather have the option of tagging as year only. There is an inconsistency across the musicbrainz database where some albums have year only and others have year-month-day. This leads to a lot of problems in mobile music players.
I like this plugin. It would be great if I could mark several albums and the plugin would find the information for each and update that info for every one. My library is rather extensive and it would take ages to do this for every album individually.
The discogs plugin can do something like that iirc.
(I also don´t find it under Prefs/Tools/Tagging...)
it would be nice if we could choose the default values for date. aka not to put full release date, but only the year