Raine Dragon
For the muliple people option, you really need to have something for the other person to verify that they are ok with the posts being made by them. Otherwise, I could see people just stamping in whatever name they wanted, which is concerning.
In all reality, if someone created a thread and put the name of another user in for every other post on the first page, that person would still have to go through the process of posting their own posts. No one can enter another person's username at random to make a post. If the creator DID put another person's name down for the rotation, they would simply lose half their first page posts. There would be no point in putting someone else's name if the two people were not creating a thread together. It could be beneficial if a notification was sent when someone's username was put in to hold every other post, but that's all.