Not quite OS X Server, but since most of us do some kind of imaging…
Check out this command:
sudo pico /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/EngineDefaults.plist
This command is on one line, remember.
Does anyone know of other defaults this concept hold true for? (This determines what settings are used for "ByHost" plists, which are used by OS X to reset certain preferences after imaging).