Whether Afghanistan does or doesn't recognize the Durand Line; its an Internationally Recognized International Border between two Sovereign States & whenever Afghanistan were to take Pakistan to the International Court of Arbitration or wherever the relevant forum would be - the moronic arguments often put forth would fall flat on their face !
What Pakistan should be asking for our certain guarantees that we'd be given access to Central Asia without our Truckers being harassed on the Afghan side & from India, Pakistan, should demand the implementation of the letter & spirit of the MFN Status by getting rid of the Non-Tariff Barriers which are making the very idea of 'free trade' laughable !