WHOA. I dont know about a longer pitman arm. What I will say, is that with a 4 inch lift, your center of gravity is higher, and sharp turning makes the truck body roll. Which if you go too far, will become a real roll. Im not sure you will be turning at higher speeds, but the same thing applys offroad. When you are on a rock turning, the same premise is true.
The opposite side of the coin is that your pushing the wheels out farther making the trucks base wider in theory.
I say leave it as it is. I dont think a shorter turning radius is worth changing the geometry of the pittman arm. once you play with the suspension's geometrics, other problems can a rise.
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