I want to modify the behaviour of Mac OSX Mavericks client when they are operating from the login screen. Specifically I want to modify the behaviour of the keyboard when the login screen is presented. Currently users can invert the colours or adjust the contrast using built in apple keyboard shortcuts. I have been able to modify my accounts behaviour as well as any user accounts that are created to behave appropriately by modifying com.apple.symbolichotkeys.plist but this does not appear to effect the screen when no user is currently logged in. Is there a way to modify the behaviour (or look and feel) of the client before a user has logged in.
Any advice is greatly appreciated