With regards to the help topic I have here:
I would like to formally suggest this as a request to be added into mp3tag. It would be most useful for me as when you are tagging on such a large scale - not having to scroll so much would be a blessing and also being able to highlight everything in one go would makes things so much easier.
I havent described the problem in detail here because reading the link I have provided will give an idea of what the problem is. I would just like to see this implemented and for us to choose either a single field or multiple fields - where if there is no info, the mp3 is listed within mp3tag.
For example - in the left hand column you could have the following - the  would be like a check box:
Show only where the following are missing:
and as you check or uncheck - mp3s show or disappear depending on the criteria you choose. So basically you wouldnt have to refresh - it would refresh itself as you check and uncheck.
If someone did a "space" in the tag (pressed spacebar and saved) - then technically it has some data so therefore it might not show up - although it isnt any valid data with regards to ID3 - so it would be good to see this ignored.
If an album contained both blank and filled ID3 tags - then an option is present to list the entire album, so that when tagging the files without tags - we can compare to make sure we add the same year/genre etc as has been put for the files within this album that are tagged.