I wish there was some way to make it so one does not earn EX as fast. Like at charter creation one could pick as an advanced player hard mode where one earns one tenth 1/10 the XP of normal. The reward is a badge say at 5th 10th 20th 30th 40th and 50th levels. Now at any time one could turn off hard mode but once turned off it can never be turned back on so if one want to earn the 50th level badge one must play in hard mode the entire time the player is leveling that character.
I am frustrated that when I makes enemies powerful enough to make them into an actual challenge to make the game actually fun I am leveling up so fast, sometimes I might actually level up one and a half levels in only one single mission, where I level past a story ark long before I ever finish it.