User blog comment:Dopp/Technical Update: June 28, 2011/@comment-3416406-20110628195207/@comment-429401-20110630223751

A much beter improvement would have been adding a remove option to categorys to go with the add button but only for admins to save opening up the page to do it (especially now 'dummy' empty categories can get added and are not obvious to users)

Wikipedia has a nice add/remove option/add-on feature that makes it a lot easier.