Nope, stock Ford keyless entry unit. Here's another wrinkle in this mystery:
My driver's side door pinswitch has been acting up for months. It took me
quite a while to isolate which door was causing my "Door Ajar" light to glow
but I finally narrowed it down to the driver's door. I had Ford replace the
switch two months ago only to have it start acting up again one month later.
That switch is now in total failure mode as my "Door Ajar" light was on
almost all day today.

I gave up last night and pulled the negative terminal off of the battery
because the darn lights kept flashing every few minutes regardless of what I
tried. The fuses are still out of the horn as well. Today, when I started
the car and drove down my street, I'd swear the darn thing was possessed. It
was ringing chimes telling me that I had a door ajar and the interior lights
were staying on WAY longer than they should. AND the radio was turning off
immediately after turning off the ignition switch just as if there actually
WAS a door open.  I guess it's off to Ford tomorrow.

dave