Bloody Stupid.
This is an extremely stupid thing to do. You can already write Prefs panes, starting with the Preference Pane template in Xcode, and you can access a users' preferences database with published API. See the NSUserDefaults and NSUserDefaultsController classes.
When you use undocumented methods, you make your apps fragile and you're opting out of getting any support.
-jcr
Biting the hand that feeds IT
