Some clients have reported a problem with setting OnClientLoad the current editor for MOSS. We have fixed and it will be available in the next official release. The ConfigFile.xml is used in the WCM and Web Part scenarios, while the ListConfigFile.xml is used in lists (which includes blogs, wikis, etc.).
file, located in \Program Files\Common Files\Microsoft Shared\web server extensions\wpresources\RadEditorSharePoint\188.8.131.52__1f131a624888eeed\RadControls\Editor\Scripts\7_1_1\
All the best,
the Telerik team