User blog comment:DEmersonJMFM/How to Utilize Custom New Page Layouts/@comment-24513088-20140816080424

Nice! Even though the official help page mentions to use the Template namespace rather than the MediaWiki namespace.

Here's what I did for my wiki: (my wiki covers a TV show and "swingin'" is actually from one of the character's figure of speech)

"New pages only:  Create a swingin' new  Character  |  Episode  |  Running gag page"