Both the Pakistan army and their jihadi allies are rational players of the great game just like India, USA and China. They are looking for their own survival and the survival of their power and ideology. Hence They are not planning on suicide anytime soon. Furthermore,let us use Occam's razor and stop differentiating between Pakistan army and Jihadi groups. At one central level, the Islamist Pakistan army and the Jihadi groups are one and the same and their long term aims are the same. I am assuming that they have joint control over nuclear weapons.
Whatever their long term aims may be, suicide and self destruction are not on the agenda. They are willing to take losses of their cadres as long as their overall aims are achieved in the long term. They are rational enough to realise that they require some base,some land and some infrastruture to survive and have nuclear weapons. Nukes do require some facilities and personnel for maintenance and use, even if manufacture is not needed.
When it comes o the nitty gritty of survival, for the Pak Army/jihadi combine - a direct fight with the US is suicide. Especially if they nuke US forces. If the US decides to use its force on them - especially nuclear forces - they will be eliminated even if the US expends 2% of its available nuclear strength on them. So the only route to victory in the long term is to ensure that they do not provoke the US. Better still would be to get the US to keep funding them. So you can safely rule out a nuclear attack on the US or on US entities.
Now it is fashionable to state that India is a soft target. "Everyone on here knows all the truth and India is set to get nuked by a jihadi and our fizzles won't work" - this is a statement that will get no arguments because it is a comfortable bottom line for all to follow. That is why I have been asking that we step out of the boxes we have built for ourselves. It is my contention that a jihadi nuke on India is as risky as one on a US entity. India will hardly get cowed by a couple of jihadi nukes and even if our missiles are fijjiles and our nukes are 15 kt fission only - air dropped nukes and conventional forces will damage the future of the Paki Army-jihadi nexus enough to upset their longterm survival plans. So a jihadi nuke on India, is risky for Pakistan. Kasab may be claimed by lunatics in Pakistan (Like Jahil Hamid) as Hindutva agent but a nuke on India will not be looked at that way.
The question that arises is,if Paki-jihadi nukes are no good against India or the US, what use are they? They are perfect for blackmail. And they are perfect for long term protection of Paki-jihadi nukes. The blackmail is the suggestion that Paki nukes may go "out of control" if the Pakistani army is pushed too hard. So both India and the US are forced to bend to this blackmail and not push the Paki army too hard, imagining, in their naivete, that the Pakistani army is keeping control of all its nukes.
In fact rationality demands that the nukes should be spread out and distributed to all islamist factions so that is the Paki army is finally cowed down by the US and or India, the Islamist forces will still have nukes to blackmail the world.