We would like to allow users with "sysop" permission to edit the MediaWiki
To do this, we have split the permission for editing the MediaWiki namespace and
user JS/CSS into two permissions: "editinterface" and "edituserjscss". I will
attach a patch for Title.php and DefaultSettings.php that implements this split
in my next update to this bug. The changes to Title.php change control of user
JS/CSS editing from "editinterface" to "edituserjscss". The changes to
DefaultSettings.php set "edituserjscss" to true by default for "sysop" to
maintain the existing default behavior.
The only repercussion I can see from this change is that installations that have
already disabled "editinterface" for "sysop" will have to add a setting for
"edituserjscss" when they upgrade.