It's annoying. On my '06, the DIC can configure locking pattern but you can't disable the auto-lock completely, so it will always lock the doors when you start moving. The best you can do it have it unlock when shutting off the ignition. I bought an interior door lock button for a newer Solstice to add it to my car but never bothered. Oddly the passenger side door panel on my car has a spot marked on the panel for the lock button, but the driver's side panel does not.
I would prefer it never lock the doors. The lock just disables the door handle, basically, so I can't see how that's much of a safety feature for collision. I suppose it could keep unauthorized personnel from opening the door while the car's running, but that's about it.