Likewise, I just did a recipe with corn sugar in it, which I added at the end of the boil. I doubt it effected my hops bittering calculations much, if at all, but it would have been nice for accuracy's sake and to still see the boost to gravity, but somehow do the rest of the calculations based on not having the sugar in there until the end of the boil. That said, I hit all my numbers from pre- and post- boil gravity exactly as BeerSmith said I would.