This is a useful setting to sort the left menu alphabetically in the Administration Interface:
... but if you use that setting with an array and try to view the contentstructuremenu.ini settings in Setup > Ini settings, you get this error:
An unexpected error has occurred. Please contact the webmaster.
 operator not supported for strings in /var/www/marigold/ezpublish_legacy/lib/ezutils/classes/ezini.php on line 868