I guess if you were to Co-own it you could help run one of the gangs, maybe grade posts, come up with missions, or even develop areas. I've never Co-owned an RP with someone before so I don't really know what exactly Co-owners do.
I already have a basic idea of the map and if you read the PM you'll find the starting towns. You could also be in the RP too, I would grade your posts.
How were my starters? I picked a diverse and unusual variety.