I am surprised they do not even mention keyless or touch pad and remote systems. On my house, I installed a keyless touch pad with redundant key cylinder for a deadbolt only. The standard latch remains using a paddle arm instead of a round knob. You CANNOT lock the door with the standard latch, you must used the keypad, house key or fob remote from outside. I go this as it allows me to give conditional entry to selected people with individual and changeable button combinations. From inside, a lever actuates the deadbolt or you can again use the keyfob.
If you shop around on e-bay and other sites, these can be had for about $125 plus installation.
Picture only shows deadbolt inside and out, add a handle for the spring latch and you are good to go.