On top of the managed client settings available in Workgroup Manager in OSX, it is possible to import additional preferences to manage to applications not in the default set. Things like default Desktop Wallpapers and Screensavers can be setup. It is possible to look at some of the default additions that can be set in the Preferences -> Details. This is done by adding the following application using the “+” button.

/System/Library/CoreServices/ManagedClient.app

This provides a sample list with no values. To additionally include values, you have to import the settings available in the plist file from the ~/Libary/Preferences/ directory.