Really, this was just an idle question:

…what would they say at Turtle Bay if Iran offered up “peacekeeping troops” in south Lebanon? Since they don’t formally recognize Iran’s role in the war, how would they refuse? For that matter, why wouldn’t they accept an offer from Syria to help “police” its border with Lebanon?

Well, now we know the answer:

U.N. Secretary-General Kofi Annan said Friday that Syria has pledged to step up border patrols and work with the Lebanese army to stop the flow of weapons to Hezbollah.

Well. That should sort things out.