Sometimes you have to be careful with the extra security. If you keep the keys separate ie take the disklok keys to bed then there's stories of the thieves come looking for you to get the keys. My brother knew somebody who had a BMW and was into electronics. Years ago when you bought Peugeots they used to have a keypad for the immobiliser, he'd got one of these and fitted it into the Beemer. When they came to take his car they couldn't start it so came back in the house while he was asleep and put a knife to his throat to get the code. Sometimes it's safer to just let them go. I know we all protect our stuff but at the end of the day they are metal boxes not people