I use dokuwiki to share informations with my clients in a close wiki mode. So anybody could try to find my list of clients, even if it's a not a "big secret", it's still annoying.
As Andi said, there is several ways to find if a page exist : the youarehere, the breadcrumb, the links into a page plus the useheading feature that gives the title of the page.
So I did create some patches to correct all these points (running without problem since 2008).
You can find more details and the last update for "Anteater" version on my website : http://www.bouthors.fr/wiki/doku.php?id=en:linux:dokuwiki:secu
Each patch is very small, just one or two line modified. As I don't find any drawback, I was hoping that the patch could be directly included into Dokuwiki.