Display in Forum Bug?
The namespaces are not listed when you click the container category.
When I use a normal forum set to "act as forum=no" to make it a category, and then use "Display in Forum" in the forum editor to put the wiki namespaces in that forum category, the namespaces are not listed when you click the container category, only when viewing the category from forumhome, that's a bit confusing for users.