How can I toggle magic mouse one finger swipe pages gesture via terminal?
The one finger swipe gesture on the Magic Mouse is technically a scroll gesture and it can not be disabled, you can investigate the specifics further with my app NSMonitor.

To investigate the correspondence of ~/Library/Preferences/com.apple.driver.AppleBluetoothMultitouch.mouse.plist entries with user interface elements in System Preferences what i do is save a copy of that file as xml, edit something in system preferences, save it again and compare the two.