Doesn't Newcomb's problem remain pretty much the same if Omega is "only" able to predict your answer with 99% accuracy?
In that case, a one boxer would get a million 99% of the time, and nothing 1% of the time, and a two-boxer would get a thousand 99% of the time, and thousand and a million 1% of the time ... unless you have a really weirdly shaped utility function, one-boxing still seems much better.
(I see the "omnipotence" bit a bit of a spherical cow assumption that allows to sidestep some irrelevant issues to get to the meat of the problem, but it does become important when you're dealing with bits of code simulating each other)
Consider the title of my discussion post. So we don't even need a near-magical Omega to set this problem. So WTF is he doing here? Just confusing things and misleading people (at least me.)
EDIT: I see by the karma bombing we can't even ask. Why even call this part of the site "discussion?"
Some of the classic questions about an omnipotent god include