I added a new page https://www.mediawiki.org/wiki/Manual:Suhosin_%28Hardened-PHP_Project_patch_... and linked this on https://www.mediawiki.org/wiki/Manual:$wgResourceLoaderMaxQueryLength
to give everyone who uses PHP+Suhosin a chance to find the settings without running through the MW installation procedure.
Suhosin is the name of a patch, and an extension which aims to harden PHP (Hardened-PHP Projekt). http://www.hardened-php.net/suhosin/
Tom