Variable Switch?
Hey,
I just read part of this thread again, why don't you just put a 3, or 4 position switch in the dash somewhere, or better yet, put a variable switch so you can pick any ride height you want. You would want to make sure you either incorporated the rear load leveling portion of the system, or disable it.
My first Explorer had a AWD V8, with an off road switch, I am sure you can get the brain from a V8 version, and schematics, tap into it and use a variable switch, that way any ride height is your choice. I am sure you can tap into your 4wd switch and find out what signals the truck to change its height.
You also may be able to get another front sensor and use it on the rear of the truck for a more accurate level, I know that the back is not as accurate as the front because of the solid rear axel and the fact that Ford put the fuel tank on the same side as the driver.

But if I recall to adjust the back you just un clip it and move the sensor up or down a notch.
If you are looking for handling at high speeds, anything you can do to have the rear of the truck sit lower than the front will help a lot. If its just for looks it does not matter…
Good luck!