I'm pretty sure you CAN NOT do that. It would sure make a bloodline/community world a lot easier to do though. Unfortunately, I think we'd have to either do it one world at a time, or a bunch at once (that are all separate).
I'd really like to start one, but my comp is too slow in generation to do the setting up. So I'll wait til the new version comes out and hopefully some peeps will start one that I can join.
I'm not sure how the history writing goes, or how much detail it goes into, but it occurred to me that, while some people in a bloodline world would want to create some really cool extravagant forts (myself included), there would also be a need for quickly created forts that would be planned for failure. That way the total number of forts in a world could be beefed up quickly, and there would be cool histories for them, like a magma flood (planned) or water flood (planned) or captured gobbies released in a fort with a bunch of weaklings with no weapons (planned).
Fun stuff!