Flex/AIR: automatically absorb unassigned/disabled key shortcuts

public var OperatingSystem:String = !!NativeApplication.supportsDockIcon ?
    'mac' :
    !!NativeApplication.supportsSystemTrayIcon ?
    'win' :
    'other';

stage.addEventListener('keyDown', function(e:KeyboardEvent):void {
    if(e[(OperatingSystem == 'mac' ? 'commandKey' : 'ctrlKey')]) {
        e.preventDefault();
    }
});