com.apple.commerce

• AutoUpdate → Install app updates
• AutoUpdateRestartRequired → Install OS X updates

com.apple.SoftwareUpdate

• AutomaticCheckEnabled → Automatically check for updates
• AutomaticDownload → Download newly available updates in the background
• ConfigDataInstall → Install system data files
• CriticalUpdateInstall → Install security updates (Der Flounder)
• AllowPreReleaseInstallation → Allow OS X Beta (HT203018)

How did I test ?

1. Uncheck everything from prefpane
2. cp com.apple.commerce.plist com.apple.commerce.orig
3. cp com.apple.SoftwareUpdate.plist com.apple.SoftwareUpdate.orig
4. Make changes
5. plutil -convert xml1 com.apple.commerce.* ; diff com.apple.commerce.* -y
6. plutil -convert xml1 com.apple.SoftwareUpdate.* ; diff com.apple.SoftwareUpdate.* -y

NB: I think "Automatically download apps purchased on other Macs" is controlled on a per-user basis by ~/Library/Preferences/com.apple.commerce.plist ; key=autopush-registered-dsids (1=YES, 0=NO)