In anticipation of XF 1.1 thread prefix feature, I'm looking for ways to optimize how my forum is setup. I believe many members here are interested in thread prefix as well. Currently, I do not have prefix on my forum and instead use the traditional subforum. When we need an additional section for a topic, we just create a new subforum. I believe there is a point where more subforum will become too clustered and may make administration a chore. Permission: I can assign very specific permission for any forum/subforum per usergroup/individual. I don't know if this is possible with prefix Linking: We can always give the url for a subforum and get RSS feed for that subforum. It does not appear yet that it will be possible with prefix. As long as I can figure away to apply subforum permission to prefix, it will allow us to remove dozen of subforums and just mass apply prefix to the threads and combine them under one forum. Members can then just filter and see what they want.