Not sure if this will help:
Contact Organizer | Zimbra :: Gallery
It's not ideal, but it may help with the example you gave...
But I agree, there should be a better way to bulk-edit contacts; perhaps a useful method would be a simple way of exporting contacts as csv so they can be bulk-edited in a spreadsheet program, and then reimporting them; but asking Zimbra to replace the existing contacts with the imports.
It's currently possible at present, but it would mess up the contact photographs for example... and probably wouldn't end up the same. The existing contacts would all have to be deleted before re-importing the contacts.