Here is an idea that is super simple to implement and will save uncountable games to be hosted by the servers.
The idea is to give Akara the witch the ability to reset (reroll) the gameworld.
If all players that joined the game are in the town Act 1, one of the players can talk to Akara and she will offer to set you to a trance (just for the flair) that makes you all forget the past few hours. Screen fades to black and the gameworld will reset and reroll like you just started a new game.
Now everybody can do what ever they want but it is the same one game. No new game needs to be created on the server.
This is the best way to prevent game after game after game to be created just to farm one mob…