Leaving one latch to lock is better then none. While it is a bit tedious to get the whole door system to work properly, it can be done. I also forgot to mention the latches are not supposed to be able to lock unless both latches are in "second locking position". No way you would know that if you disable the locking function. If the doors are not adjusted properly it is most often because one or both latches were not in second locking position and then the door lock was forced into the lock position bending the actuator rods inside the door. Once the rods get bent it becomes possible to lock the door but one or both latches are not in second locking position. It is always up to the owner what short-cuts he wants to take, I like to get everything working the way it was intended to work if possible. With some patience and time you can get the doors to work properly unless they got tweaked. Once they get tweaked (forced and bent) the welds and glue come loose and the door becomes floppy. It is impossible to get it to hold any adjustments. Usually happens when you hit the open door moving in or out of your garage.