Changing the maximum length of a title will require a huge number of changes and is not easy to make configurable so we should do this only one time changing the maximum length of title to the maximum we can feasibly make it.
~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://danielfriesen.name/]
Reposted to https://www.mediawiki.org/wiki/Page_title_size_limitations .