I've long augured even back from the early Beta that FATEs should be tweaked a little to be more like Campaign battles in that to participate you don't just show up, you have to speak to a NPC to get 'FATE status' or something similar that allows you to participate in the content (thus removing annoying FATE participation from interfering with other content like leves, quest battles and Hunts). Sadly though, nothing has ever been stated on the subject, so it seems SE are committed to keeping the FATE system as it is.