My suggestion is a far larger scenario, which may include a preemptive strike by the Indians against the Pakistani nukes. I would speculate an all out war between Pakistan and India, including nukes, and conventional weapons as well. I may have been a little quick to suggest full support from the U.S., Russia, and China, however under your scenario the cat would be out of the bag so to speak, and I could conceive that it would lead to the "world war jihad" as you described.
Pakistan wants American planes to stay away from their nuke sites, I think that's why.
They don't want Indian planes POSING as US planes to get near their sites, and blast them (while the anti-aircraft guns are silent because the Paks think the planes are American and don't mean any harm).
I was wondering why Pak would want to keep US planes away from their nuke sites, because WE wouldn't pre-emptively strike them. I thought Musharraf might be getting a little paranoid, that would be a very bad thing. Hopefully he's just worried about Indians.