When you select "ID Tags" and then in the new window in the upper left corner "Sort Tags", you will see a new window with, e.g., all "Artist Sort Tags".

It would be extremely convenient if a filter field could be added to allow searching of specific strings in those tags. Even a simple search field would be enough which allows to search for a text string in both tags (Artist and Artist Sort).

If you have a huge library with around 5.000 artists and you add a new compilation CD, it is extremely stressfull to search for all the multiple artists.

Of course, the search functionality could be extended (which field to search for, regular expressions, etc.) but simple search would increase customer satisfaction significantly :-)