Why would they make you press it twice? Surely everyone wants to activate deadlocks each time they leave their car? It'd be easier to do it with one press!
http://www.my-gti.com/1022/alarm-chirp-on-arm-and-disarm-with-factory-alarmEnabled mine yesterday!
The exact reason I enabled the BEEP on lock function in VCDS so i know if i locked it or not!