Quoting Heavenfall, reply 1I don't believe there's a way to alter that, beyond adding sovereign abilities.
Ohhh, your on to something here. Gotta look at that code
Edit: Was testing adding that ability in as a sovereign trait, didn't work
Its not a sovereign ability, but a faction ability. When I have been play testing, I have been quickly hitting "next" in the game setup screens, so I always start with Altar for testing purposes, so for now I can just modify the "Resourceful" faction ability they have to create custom starting resources.
It isn't perfect as it requires the user to choose the bonus, but its fine for where i am at with testing.