[Pachuco]

For editing tags, the "Tag Browser" is inferior to the "Tag Editor", which allow use of filters to quickly narrow down existing tags (I'm not sure when the latter was added but it is in Calibre v. 1.19).

The concept of "Editor" is geared towards an individual book. It could be made universal if a right-click of an existing tag would allow us to edit it. That I find would be extremely handy!

Having such an enhanced "Tag Editor" available as both a toolbar action/button and a keyboard shortcut would be close to perfect (I presently have 1,504 tags).

Cheers!