I thought you'd previously said that although you produced the beginning of Elcenia this way, it wasn't enough of your thing that you'd want to try it again. But maybe I misunderstood.
Today I probably won't have the time, but I'll see if I'll manage to catch you tomorrow evening. (Or some day after that, if you're busy tomorrow.)
It depended heavily on the rapport between me and my co-creator, but it worked pretty well for a couple of years and at peak we could gleefully write at each other for seventeen hours a day. We produced a couple million words of usable plot and character development and had a great time through most of it. I think I'm probably not good enough at Playing With Others to do this with arbitrary people, but you're worth a try, and if the finished product is clearly intended to be yours, I think I can back off on my steamroller tendencies.
This community has a recurring interest in "rationalist fiction," and several members who are writers. I wonder if it would be useful to create a space where Less Wrong members could provide each other constructive criticism and encouragement on in-progress original writing projects?
Disclosure: I'm working on a sci-fi novel right now, and my regular circle of "beta readers" are fantasy fans and aren't providing much feedback on the new project. I am much, much more productive as a writer when I get steady feedback, so I have a personal interest in looking for something like this. Less Wrong came to mind as a community of intelligent, creative, forward-looking types who are likely to enjoy sci-fi.