Well, as in case of Afghanistan, where there is infighting among different tribes, races etc, demonizing pakistan will provide a bigger stronger enemy which will unite the afghans against Pakistan.
Easier said than done in Afghanistan, because the only thing the Afghans are united in, is being disunited.
People across the durand line have similar culture and traditions, they have intermarried among the tribes making that border area to have common links, but lets not forget similar situation of common culture stuff existed (offcourse on a smaller amount) in indo-pak border areas too but was very easily replaced by nationalism. If the Karzai government can play it's card right, and coerce pakistan into fighting back at durrand line, there will be sympathy for afghan forces across the board and then the same version of religion which was used to destroy afghanistan can be used to unite against pakistan.
I doubt it, there is no "Across the Board" when you talk about the Durand Line. You could unite people against the Soviets and Americans because:
1) They were foreigners.
2) They were non-Muslims.
Pakistan is neither, never has any tribe tried to cede from Pakistan, even though the USSR and Afghanistan pushed the Pukhtunistan issue to it's height. I don't expect them to do so any time soon either. These people are known for their strong sense of loyalty, they will not let it fall pray to the fancy of a state that has yet to learn to stand on it's own.
This might be the golden oppurtunity karzai has been waiting for, have a disciplined officer corp in military wing, so that the top level is not radicalized. Create offensive against pakistani army, start maneuvering afghan taliban to move in the lines of TTP as cannon fodder. Pak army if has to fight afghan taliban at any instance, they will demolish taliban in all out fights.
Karazai will have to wait for that officer cadre to mature, even if you expedite their promotion, let's say you have a fresh military hierarchy in 10 years from now (I am being overly generous, a more realistic estimate would be near 18 minimum). Where do you see the Afghan govt and military stand until then? They cannot hope to call time out and expect the Taliban to wait until they have a mature enough officer corp.
As for the other point, an offensive against Pakistan will be the untimely demise of the ANA, let's not forget that the PA is trained keeping in mind that these men will be expected to fight almost 6:1, The PA is and will be, quite realistically speaking, a fighting force much superior to the ANA for many coming generations.
It could result in better integration of afghans, especially the new generation, effectively dismantling afghan taliban threat, ensuring propping up of existential threat from pakistan which will lead to heavily centralized form of government (similar to pakistan viz-aviz India), Ensuring continued support from India.
Again, you seem to ignore or misunderstand the Afghan situation. To the non-Pushtun portion of the Afghans, the former Soviet states of their ethnicity appear as a very desirable model of statesmanship. These people are literally jumping out of the country for a chance to move abroad, a united Afghanistan will require decades of sustained economic growth, which under the threat of the looming withdrawal and expected post-withdrawal violence looks dim. Pakistan itself would choose to support a peaceful transition, we have enough Afghans within our borders than we would care for, another refugee crisis in the offing is not our favourite option.
It would be indeed interesting to see whats on the wishlist,
Field Guns, anti material rifles, mortars, rescue helicopters, support vehicles, LAV's, field medical equipment, night vision equipment, MRBL's etc. is in the likelihood the list would be interesting.
Interesting it would be indeed, however, one has to wonder how much liberty India would be willing to extend to Kabul at the expense of deteriorating it's dealings with Islamabad. We're far from bossom buddies but India knows that a content Kabul is not a great counterweight to a pissed off Islamabad. As much as it would hurt India to admit, Pakistan is still a greater priority as compared to Afghanistan and to keep Islamabad pacified is in India's best interests, which at the time are vested in it's continuing state of security and economic fertility, an escalation with Pakistan would upset the balance and throw India off her goals on both grounds. Remember the flight of capital in the 2002-03 escalation? India would always choose to avoid the same situation from re-accuring.