Iran has said countless times it is ready to work with Pakistan, so there is no issue there.
http://www.presstv.ir/Detail/2016/06/20/471297/Iran-Pakistan-Zarif-Noor-Muhammad-Jadmani
http://www.presstv.ir/DetailFr/2016/03/25/457520/Iran-Pakistan-Rouhani-Sharif-Islamabad
Saying that we should build a 700 km wall is just fanciful, at least for the foreseeable future.
If Pakistan's attention is mostly diverted towards India or Afghanistan, then surely Iranian UCAVs attacking terrorists across the border should be seen as a helping hand? Why are some members here so hostile to such an action? Its not like we are Americans with vested interests - we have terrorism across the border constantly and there is only so much you can fight inside your own borders when the rats don't recognise borders. They have bases in Pakistan. The best way to fight these militants is to find where they are (intelligence) and kill their leaders and members (UCAVs, arrest and execution). If Pakistan is busy elsewhere, then Iran could lend a hand.
Correct. Stability in the Balochistan area is in everyone's interest. Now, I don't know about Indian involvement in the region, but surely they will want security there now they are investing in Chahbahar, as does China in Gwadar, and obviously Iran and Pakistan.