MMO Lobby for other fun and casual games. (:
Have a area in the map where the MMO can act as a lobby or even a host for other games(example: tower defense, stickman, dating sim etc..) where players within the MMO can play minigame created by other people, when conquered can give special reward inspired by the minigame within the MMO!
DESIGN SCHEME EXAMPLE:
A actual arcade within the game filled with arcade machine acting as a portal to other games.
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Dustin Stone commented
While this is a good idea the thing is sim9 would have to make those games first besides the lobby your describing sounds a lot like root. I will say that is sim9 decides to make minigames and such like tower defense though i dont see that anytime soon he will most likely make a telepad for it at root.