Search based on excluding tags

Hi
Recently I have been working on "bird" term and tag (some 45 pages of hits with "bird" lettering). Many coins already have this tag, but since user is unable to exclude these coins, you actually have to open each coin page to check. It would be of enormous help if in advanced search user could include OR (for updating purposes) exclude coins with selected tag or tags.
Thanks

Hi
Is anything moving in this direction?
Thanks