Automatic door locks

I can't find anything in the manual for my 2000 Mystique that indicates it has any sort of automatic door lock. Other cars I've had have had this feature; I'd really like to have it on this car, as the door lock button is in a most awkward location (for me at any rate). Does anyone know (1) if there is some hidden feature on this car that can be used to program automatic door locks or (2) where to find an aftermarket automatic door locker that won't make me give up my factory remotes? Thank you all.