I had an F150 before I got my JK. It didn't come with the keypad entry and I wanted it. The dealer was able to install it. Seemed pretty easy. A hole drilled in the door to run the wires through and then the keypad was mounted with adhesive backing. It worked perfectly.

I have been wanting one for the Jeep too. I just haven't gotten around to it yet but will probably try it this summer. It was $99 to add it to the truck.

 

Ive been thinking about this, and think I am going to do it on my jeep. Im going to make it myself and have it activate the unlock/lock from spare key to open it up while disabling the alarm.