Hello.
The Wikibooks projects make heavy use of hierarchical structures using "/" as
delimiter in page titles which can result in very long article titles in rendered
documents and books. With this changeset
http://www.mediawiki.org/wiki/Special:Code/MediaWiki/73454
(and the follow-up r73456) it's now possible to tell the Collection extension via
$wgCollectionHierarchyDelimiter = "/";
to set the part after the last "/" in a page title as a "display
title", i.e., the title that is displayed/rendered instead of the real page title
(cf. the part about renaming articles on the help page
http://en.wikipedia.org/wiki/Help:Books/for_experts#Saving_books).
I suggest that this setting will be included in the configurations of the MediaWiki
installations for Wikibooks.
(Unfortunately this can't be enabled as a default for all MediaWiki installations,
because there are lots of wikis that have "normal" page titles with
"/" in them, e.g. [[AC/DC]] on
en.wikipedia.org.)
-- Johannes Beigel