After doing some research, the LCS throw damage bug is legit per amazon Basin testing. Quick rule seems to be to subract a third of listed damage to get --some-- idea, or to use a weapon damage calc like this one.
http://diablo3.ingame.de/tips/calcs/dmgcalc/dmgcalc.php?patch=110&lang=engThe attack rating bug that affects Amazon ranged attacks, does NOT seem to affect Double-Throw, though there are many posts saying it does. I found a post somewhere about a guy who tested it against a Sorc with known defense, and results were consistent with the attack rating being applied. I stupidly didn't bookmark it, though, and I'll be durned if I can find it again.
This is consistent with the fact that Morholt would have definitely noticed if his already admittedly marginal chance to hit was not receiving the huge, huge AR boost that 14 hard points and +to skills gear would have given him. Damage is pretty easy to miss, since he's at "way more than sufficient", but an AR swing that huge is definitely noticeable by a human over that much time.
If anyone finds that link again for me, I owe them a cookie.
Also: I had heard that throwing a weapon while Iron Maidened can cause the deadly IM damage if you're within melee range of your target. Can anyone confirm/deny? I'm an HC barb, so this is pretty thoroughly non-academic....