The #1 annoying thing, that in my opinion, prevents people from testing the end game stuff is... *drum roll*... The lack of the ability to copy one of your characters over from the regular servers. With trying to test 1.3's dye system, this comes full fold because I have to level up and get those stupid achievements instead of just being able to copy over my v12 and dye away.
Murphy's Law of PvP : If it can be abused and or exploited, it will be abused and or exploited.