I haven't seen this proposed elsewhere, but I would love to see the addition of a Mutation or Genetic origin type. It seems natural in a Superhero MMO and I was surprised it wasn't present in the character creator.
I see a gene mutation as quantitatively different from a Science or Natural origin, as a gene mutation may be caused by any combination of factors natural, scientific or otherwise. Also, it would fill in the void left by the origin descriptions of the existing types, which don't account for characters like Superman or Cyclops.