Sir,
I will give you some high probability scenario ,which can be expected from Pakistan,in case of full fledged war.
1 We have taken out almost all of their airforce,their armored strength has been demolished.Indian army mechanized and armored column has cross over into Pakistan territory ,and are taking ground at fast pace.At such time Pakistan use its tactical nukes on our army columns,and turn them into dust.Now in such case Pakistan has used nukes but inside its own territory,that too as a conventional weapon targeting advancing enemy forces inside its own territory.I know GOI official stand on it ,that tactical nuclear attack on our armed forces will be taken as a nuclear strike,but still situation will be tricky.
2 If Pakistan decide to use nuclear weapons ,then strike will be massive and they will go full out all guns blazing,as they would be well aware of what will follow next.So without taking chances they will use it all in the initial phase.So either expect a very small tactical strike, or else a massive barrage of whatever they have got in case of a nuclear strike.
3 In case of Pakistan you never know,when someone religious fundamentalism crops up ,in the heat of war.And if that person has access to nuclear missile,he decide to go in full zehadi and suicidal mode ,where his one and only objective is to destroy India.So you never know when it could get nuclear.
4 You say we will have a limited conflict,but then what?you fight and then after sometime Pakistan once again return to its terrorism.I think the war should be decisive ,which should end with either complete destruction of Pakistan army,or balkanisation of Pakistan,or we occupy most of the Pakistan and leave aside "Chotu Pakistan" that will not be allowed to keep any defence forces ,only police and after war ,we contribute and focus towards westernization of "Chotu" ,so that their main focus is in education,health and economics rather than religious fundamentalism.So basically there should be some decisive outcome of war,even if it means that we have to bleed.Things can't be allowed to return to as it was prior to war.