[baseman101]

You can add games that aren't on the Steam store to your steam library. Just press:
Games>Add a Non-Steam Game to My Library

The whole idea of iOS servers being accessable via Steam seems pretty cool. I don't see too many MMOs on Steam, and adding Graal will certainly boost the playercount a bit. It would be a good thing to consider, if Graal ever manages to pass the greenlight and pays the fees.

All-in-all, I don't see it happening, but hey, Graal made it to Android, why not Steam?