Categories are tags added to pages; restricting
content
access based on them is dangerous, as users could open up
holes just by adding or removing them. If you must try to
restrict (edit) access, then I would recommend doing it by
namespace (custom namespace tutorial/overview at
http://www.mediawiki.org/wiki/Manual:Using_custom_namespaces)
and using the $wgNamespacePermissions configuration variable.
Wikipedia does this with JavaScript; we provide support
functions to allow this. Have a look at
http://en.wikipedia.org/wiki/MediaWiki:Common.js - search for
"Extra toolbar options".
Thanks Rob, gonna check out your both advices
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