Let me clarify the groups for everyone. There is the taliban in afghanistan led by Mullah Omar. and then there is the tehrik-i-taliban pakistan, led by Baitullah Mehsud who is also in alliance with radio mullah, Fazlullah.
there was a faction in waziristan, but I think the army has a peace deal with them which has been in effect for a long time. anyways, baitullah mehsud, head of the TTP, launched a campaign of suicide attacks on PA. Mullah Omar of the taliban in afghanistan booted him out of the taliban and cut all ties with him. here's a nice article by our very own, jana
Rift in Taliban ranks: Rumours of Mullah Omar sacking Mehsud
he specifically ordered baitullah to lay down arms against pakistan, stating that pakistan wasn't the enemy. however, there are strong takfirist elements within TTP, not to mention egyptians, uzbeks, etc.
I was an advocate for wiping out TTP a long time ago. FM Radio mullah Fazlullah would be a piece of cake, keeping in mind Swat doesn't give him much support (they didn't have much to begin with, it's a tourist attraction).
as for Mehsud, there's just one tiny problem. to get rid of him, you have to possible fight the whole mehsud tribe. keep in mind guys, the mehsud and waziri tribes are notorious in pakistan. before this crap even started, they were admired as the most ferocious tribes who never gave in to the British. we can't possibly go against mehsud even if we know we can take him out.
that's why the army is trying to strike a deal. we probably know he's going to violate it, which is why we'll do stuff like operation zalzala. drop pamplets for people to leave the village and then destroy the empty villages. this way, we will try to isolate him, which we've succeeded at for the most part by getting the other tribes to disown him. once he becomes the source of all problems, we only have to wait for his own tribe to kill him.