Threat posed by small battlefield Nukes mounted on tactical battlefield missile like Nasr has already been addressed by the addendum added to Indian nuclear doctrine in CCS meeting held in 2002.
It will be suicidal for Pakistan to hope that, use battlefield Nukes on Indian division(even on Pakistani soil) will not invite a full scale nuclear retaliation.
So unless Pakistan is going to for full scale nuclear response, it can/will not deploy small battlefield nuclear weapons.
Which makes Nasr's utility in a limited conflict, such as envisioned in Cold start doctrine limited to using conventional explosives. In which area it more than ,matched by India's Prahaar missile , which has almost three times the range and two times the missiles mounted on a single vehicle.