That would be the biggest wet dream Iranians will have, if the clerics did not have heavy influence politics. The president of Iran is a puppet of the clerical courts, and politically the Mullahs have the last word over any president there including on use of military force.
Westerners always make a big mistake of separating Sharia law as just religious law, but Islam is not just about praying to God, it's also controls day to day lives of the people, and politics is inseparable under desired Islamic lifestyle. Concept of separation of Church and Sate is foreign to Islamic cultures, unless they are controlled by dictators.
There is a reason why the Muslim Brotherhood, Alq Quida, Jamal Islamiya all intend to topple "secular" dictatorships/governments in Islamic countries, and impose classical--Taliban style Sharia governments.
Iranian clergy has been flip-flopping on use of nuclear weapons and ultimately approved the use of nukes against Kufars/infidels which under Sharia will include homosexuals as well, but of course Sharia is nice enough to say it is wrong to kill innocent people. Iranian Shiate Sharia interpretation is much more radical than Sunni and Suffis, especially on idea of sacrifice for 9th Imam. I would be much more worried with Iran having nukes than Saudi Arabia under King Abdullah.