Y'know what would be fun
If you could perform actions with other players/animals etc.
Like /play on your pet and your character just starts to play with it.
Or /kiss towards a player and your character positions itself and tries to kiss the other.
There could be a contact-system so the more you play with one particular person the more your characters befriend theirs. Which in turn opens more option for you to perform to the other. (Such as kissing because I imagine kissing strangers would be something weird).
I just realised this would be some sort of Sims MMO.