How can I distribute mandatory settings (system and LibreOffice settings)?

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http://askubuntu.com – I'm a Linux sysadmin and I maintain 100 Ubuntu desktops. We're about to upgrade to 12.04, but before we can do that we have to make Ubuntu PCI complaint. Meaning we have to lock some mandatory settings from the users. I've done all of the settings except the following. The last PCI settings: Users may not change their screen saver timeout, it has to be set to 5 minutes. Users must always unlock their screen when the automatic screen saver is enabled and a keystroke or mouse movement is initiated by the user. I also want to push default LibreOffice settings e.g. the hardware acceleration i (HowTos)