Thread:Project:Support desk/How do I enable the edit throttle

The page http://www.mediawiki.org/wiki/Autoconfirmed implies that mediawiki can throttle edits. Currently my LocalSettings.php file includes the lines:

What I expected to happen with the above settings is that a new spam account might be able to slip in one spam per day, but the mediawiki software would block any other attempt to create a new page or edit a pre-existing page until tomorrow.

What I see actually happening is that one spammer can register a new account, and then through that one account create several pages full of spam within the hour.

How do I enable the edit throttle at http://opencircuits.com/ ? MediaWiki	1.19.2; PHP	5.3.27 (cgi-fcgi); MySQL	5.1.56-log.