- Login as guest, edit the whatever preferences you want to persist.
- Don't log out, go to admin user, execute:
sudo cp /Users/Guest/Library/Preferences/*.plist /System/Library/User\ Template/English.lproj/Library/Preferences/
- That's it.
- Why is this so difficult?
Actually that's a pretty cool tip to be honest -- didn't know you can persist the guest settings - thanks, buddy!