Many of my favorite hubs have rules such as "only music is allowed in your share" or "only anime is allowed in your share, nothing else" and for obvious reasons most of the time I can only go into one of these hubs at a time.
If there was a feature that you could specify different directories to share for individual hubs (like in the favorites list, maybe) then it would make things alot easier and increase downloading/uploading.
I don't know if this would be hard to implement, but this feature would be really useful to me and I'm sure alot of other people. I can't think of any downsides to this, either.
If you need me to clarify, let me know. I can be pretty illiterate :p
I'm sorry if this has been suggested before; my search to see if it was was half-assed.
edit: it would also save people from having to change their share through settings every time they wish to join a type of hub listed above, as that's become an annoyance