Just an FYI I recently bought a $100 Auto Start/Stop eliminator plug for my Navigator, it works flawlessly. It's just a plug cap and there's no reprogramming to risk any warranty issues. It's basically like inserting a USB stick in complexity. It's also recessed way under the foot area that can't be seen. USA made, all positive reviews, and can simply be unplugged for dealer maintenance, if they were to even care.
I just leave it in 4x4 Normal these days, it's already plenty powerful that have no need for the "excite" mode on a 6,000lb vehicle.