Help!/Displaytitle?

Is the use of a Displaytitle template appropriate on this wiki, or are they banned? Let's take a random example: Eleventh Doctor (The Curse of Fatal Death) has a long enough title that it forces a rather unseemly line-break between "Fatal" and "Death". Typing:

{{DISPLAYTITLE:<small>Eleventh Doctor (The Curse of Fatal Death</small>}}

(as is, for example, policy on the Scrooge McDuck Wiki) would solve this issue.

However, it does not appear to be done anywhere on the Wiki. Is it banned for some reason? (I presume that using it to obscure dab-titles is, also, though I don't really understand why either.)