AND the ability to load in a map into the sky directly when the sky tag is applied.(then automatically switching to the hdri map) For me, this is a time saver. Don't have to create an extra material. (It's in the feature req. list but not in this form)
It could also have 4 more channels for visibility, refl., refr., vol.
Saves even more time and materials and skies*. (*for people who use skies instead of the scene environment tab)