That is a miracle! But let's not swerve off topic, though... so I'll add in a bit more of my opinion regarding the main idea of this thread....
I think it it a great idea! I really do! However, the issue here is that it may rarely be used, since many authors like to write by themselves and not with a co-writer. Also, those far and between people are most likely already accustomed to writing on another place which allows both(or more than 2) authors to add in the story ideas. One such example is Google Docs. That is probably a popular choice that people have when thinking about how they can write with co-writers online. If you live close to each other... that's a whole different story.
Summary: My main point is just that it is likely that very few people will use the feature, and adding it may not be necessary since there are so many other options to choose from. It is sounds cool, but not that needed. That may be a reason many like that idea, the coolness that it shows. But when it gets down to it, you may never even use that feature...
So yeah... but I still upvoted it, cuz I fell in the "Cool!" trap... lol,,,,