Actually, I feel much better when there is story in the level, but I'll check those later.

http://www.speedyshare.com/file/2VqVT/Hub-Level.zip

Won't work via "save and run". Ignore that "awesome additional quest", "power ups" and collapsing scenery at the end of levels thing, I tried to make some achievement system but it didn't work. Anyway, this is an example of hub level. That solves every of our hub problems I think. JJ2+ is necessary.