This is the kind of issues that should be refereed to an committee of Ulemas (scholars) for legal rulings based on Pakistan's circumstances. That is why Islam encourages consultation between the rulers and people of knowledge both islamic and non-islamic knowledge.
As a Muslim I think the very least, any Muslim country that claims an islamic character must regulate blahsphemy law within its jurisdiction. Any bigot who dare to write anything against Islam while living in PAK should definitely be subjected to the full force of law and any blasphemer living abroad should either have an arrest warrant for if & when he/she lands in PAK or there should be a permanent ban on hi,/her to entry into PAK.