Explorer System: Make que character (at least 200+) explore Maps (no he will not be on any map walking or like a bot) to get silver and some materials but no Exp (Like DFO), is a option to get silver while not playing with some characters and leveling the others and helps a lot to gather the new Rank Attributes (very expensive). Or just improve the silver get from monsters.
Training: The same as Explorer System but to get Exp (exp only)
AFK Auto-Kick: If no action is take after some time and is not waiting on Dungeon Searching just kick him, the good thing is that it will remove AFK players in the some maps which can disrupt other players.