Board Thread:Support Requests - Getting Technical/@comment-1364889-20140511145715/@comment-1330470-20140511203250

Love Robin wrote: Actually, you don't want to use the Dev solution as it has been superseded by the native MediaWiki feature of the same name. However you have to have it enabled by Staff for your wiki. So if you're an admin there you can request DISPLAYTITLE through Special:Contact. Be sure to ask/remind them to set $wgRestrictDisplayTitle = false so that it will do what you want instead of the default of restricted to just the same words but with different caps (useful for displaying small first-letter words like "iPod", etc.)
 * Warning :Visitors *expect* that what they see at the top of the page is the *same* as the PAGENAME url, and may get frustrated when typing in what they see will not take them back to the page. Somewhere on the page or wiki you should advertise the need to watch the url for the proper PAGENAME

To be clear, my understanding is that DISPLAYTITLE is enabled by default - however RestrictDisplayTitle is true, and so you can only make small changes such as caps, italics, et cetera, and can't change the actual wording.