User blog comment:Ralok/Just a Thought/@comment-160529-20120711042822/@comment-4674838-20120711043807

If that particular feature of being able to add categories easily really is a problem on your wiki, you could ask staff to disable it or just do it yourself with CSS in your MediaWiki:Common.css: display: none; }
 * 1) catlinks #csAddCategorySwitch {