QUOTE (ohrenkino @ Apr 29 2012, 17:30)

I am not quite sure what you want.
if you are looking for additional information then use the web source scripts. I think the pone mod for discogs is a fairly good choice as you can select a wide range of parameters.
Or are you looking for files that already have one of the fields filled?
Then a filter like
%publisher% PRESENT
shows you all the files that have the field PUBLISHER.
Or do you want to add a field to the tag panel so that you can enter the additional information there?
The have a look at Tools>Options>Tag Panel...
When I tag my files, I want to the app to find more information such as Label, producers, publishers..whatever is available in the tags extended information.
In the player I use it shows the extended information and much of it is empty.
I just want to have MP3tag find and fill in whatever information is available.
I hope that clears it up a bit.
Do you understand what I mean?
Is there a way to have Mp3Tag search for more of this extended information and add it to the tags?