Sins on Oxide with mantle would be incredible. I'd love to se Sins offered as a persistent universe RTS with customizable starting races unique to each player.
That would be pretty amazing! I think it would be best though to not have completely "unique" races, but have sub factions of the races we know about. I enjoy the lore of the Sins universe and I don't want to throw into the mix a 100 new races just because its an open world persistent universe. Give us the ability to customize our planets, our tech, and in turn, our Starbases and Titans!
Seriously... who doesn't want to customize their own TITAN!!??