Good Evening,
Your question reminds me of the garage door keypad. If you are a bit technical you know you can remove it, smash it or whatever and short the two wires and bingo, the door goes up.
Plug the garage door opener into an appliance module and your security has been dramatically improved. Most people would not expect the second remote control system.
I would not recommend x-10 for serious security applications but read the forums here, there are many that do and they are very happy with them.