I’ve just commissioned a coder to create a system for downgrading Editors and SysOps for the Eurekapedia. Surprisingly, the MediaWiki script does not have any built-in ability to do this. Why, I really don’t know.
He’s also made some changes to the way the script handles usernames and page titles: Namely, removing the way the script forced an uppercase first letter.
A couple of people from the MediaWiki list felt this change to the script could lead to problems. So far, my testing has not shown any problems.