One thing that annoys me is that I have no choice over what co-authors can do. Something that I really want is a co-author restrictions page which allows the author to choose the things that co-authors on that story can and can't do. Some examples for restricting or allowing include:
Publishing, deleting, scripting, changing description, making links, creating pages, adding items and adding variables. If I could choose those sort of things then not only would I get more co-authors, but I could ask my teacher if we could set up a huge game and all of my class could contribute and become members! That would be awesome if me or my teacher could change what co-authors could do!