I installed my own keyless entry for my power locks. I got the unit from Ford & it is very basic. I press the unlock button on the fob and all doors unlock.

There is actually a selection of systems from Ford that will work with the PATS system. Each adds additional features and are only slightly more complicated to install. Check out the various systems at Ford, I'm sure you can get one that has the double key system, and truck release, and double click for all doors to unlock, and whatever.

Must be that jumbly-wumbly thing happening again.