Overview of extended tags

I have an idea for better handling of extended tags: With an Option under "File - Options - Tag Panel" you could add a feature, to display all (non-visible, not explicit displayed) extended tags. (Direct editing would be nice, but it is not important I think)
Additionally a new column in the list would be helpful, that indicates if the file contains such non-visible tags. This would give a quicker overview of hidden tags.