Re: Can only find 2 permissions for Categories
What version of TikiWiki are you using? You should have 4 and the Categories Details page over on Doc-Tiki should help you understand a bit better what each one is used for.
Try going to the tiki-admin_system.php page and emptying the caches, to make sure that you are seeing all permissions correctly. If you are using a version of Tiki prior to v1.10 then you are strongly encourage to update to the latest version.