Iran should require two very reasonable things with world-wide support:

 1) Iran and Israel both denuclearize down to zero at the same time and submit to inspections by a provably dis-interested regulatory body (the IAEA being a sick joke at this point.)  This is easy for Iran because they their nuclearlization was primarily an artifact of Israelian sponsored propaganda with no demonstrable basis in reality.

 2) An equitable two-state solution for the Palestinians.

Until both conditions are met, I would suggest to just keep on with nightly missile attacks and targeted assassinations-in-kind to sink both Israel and anyone stupid/evil enough to 'stand with Israel'.