Extension:NoCat

The NoCat extension adds a magic word  that disables categories on a specific page.

Configuration parameters

 * $wgNoCatShowCat: Whether to totally disable categories, or only disable adding to categories. If set to false (default), categories are totally disabled for the page. If set to true, the page is not added to any categories, but the list of categories that the page would have been added to is shown at the bottom of the page like normal.