The jirga proposal you referred to was one that I believe originally came from President Karzai. He envisaged having meetings of Pashtun tribes on both sides of the Durand Line--he wouldn't say the border--to try to maintain security in the area. Of course, neither the non-Pashtuns in Afghanistan nor the Pakistani government accepted that proposal, so they are now working on something different.
But there's a fundamental problem. Jirga is used as a national institution in Afghanistan, but it's not used as a national institution in Pakistan, so there's no symmetry between the two sides. They're having a great deal of difficulty figuring out how to actually do it, and I don't know if they'll succeed.
On the second point, I think it's absolutely true that this is not just an Afghan problem; it is a regional problem. The border between Afghanistan and Pakistan is not just a question of recognizing a line, because the border is more complex, as you mentioned. They refer to it as the three-tiered frontier because the British drew it so there's a line between the administered territories of Pakistan and the tribal agencies that are not administered.
By the way, the Afghan government has certain rights in those tribal agencies. They used to recruit soldiers from there, and they have relations with the tribes. The tribes send messages to President Karzai telling him what they want him to do. These are people on the Pakistan side of the border, and they fight in Afghanistan on both sides.
Afghanistan was under British suzerainty, and the outer border of Afghanistan with Russia and Iran was considered the security border of the British Empire. It's now more or less considered the security border of Pakistan as well. That's what the doctrine of strategic depth is about.
So there's a whole set of issues involving the internal structure of Pakistan, the relations of Pakistan to Afghanistan, and the way Afghanistan is settled in the region, which need to be revisited. It's currently run under a colonial agreement from 1905 between Britain and Russia. It's a good time to revisit this whole set of agreements, because the international community is there and can help with the confidence-building measures and particularly investment in the development of that frontier area, which would provide the people there with livelihoods other than smuggling and warfare.