I would have to disagree with your assessment that the IRS wants all amounts to be rounded. The reference you made said a filer "can" round. So it is optional, in my opinion. It should say "should" if that is what they want.
It also says, "If you do round to whole dollars, you must round all amounts." So If I decide not to round when copying amounts from, for example, a 1099, Turbo Tax should not round in the worksheets. But they do seem to round in the final form, so you do have a point there.
