For awhile I've been wanting the same thing until I found that you can disable every faction element (wilderness spawn protection claiming power loss and stuff like that) in other worlds just look in the config
oh well then if it doesn't have that capability in the older version I highly doubt the author will make it for that version when it's in newer ones even if you are using it for a mod server or something
Not only that. He could do this with permissions for each world folder by disabling them in each world he does not want them to be able to use factions.