Code + and - options are just for setting. Yes you could keyswitch disarm with a magnet or button but it's poorly advised regardless of keypad position. Be like the switch on sensors that disable them. Get proper gear installed well managed by those that know what they are doing. I get some may think they are paying extra for something they can do themselves. Yes you can. Like you can extend your house, modify you car etc, thinking your fully insured and its the insurance company problem. The insurers want to sue someone when an intruder alarm doesn't perform to counter the claim. 

22 hours ago, al-yeti said:

 , unless you dip it in freezer for few hours

Wont that default it though?