Are door locks really a big deal if everybody is wearing their seatbelts?
My fiancee wants them to lock so that she doesn't forget to lock them and end up car jacked or something. I don't worry about it because I would enjoy seeing how my Springfield .45's Hydrashocks perform on a person, but she doesn't carry a gun so she's scared of people walking up while she's at a light and just hopping in.
Only way I know is to install a aftermarket alarm that has this feature built into it. I have one (listed in my sig) and it has this feature and I like it very much.
i used to have an alarm on my P5 that would lock like that...not fun when it locks and your not in it lol so be careful, i recommend rolling your windows down when you step out of the car for a min and shut the door..