Even setting aside its one appearance post-Frieza in the anime, there's still no reason he shouldn't be able to use the Kaio-Ken as a Super Saiyan, it would just be impractical most of the time because it's only a momentary power-up that would probably leave him drained. And their stats for Goku only seem to go by the anime in terms of Super Saiyan 4 being allowed in the original fight; the weight-lifting/crossing of Snake Way were both in the original manga. Superman's feats are actually all post-Crisis, albeit, as DochaDocha said, the very biggest stuff they could find.