Well I could see it like you could join a person's game with your own character and you could possibly have a vote among players to choose an option. The tie would go to the host. So if you have 3 players playing and two players choose option 3 to kill the guy, and the other player chooses to option 2 to peacefully negotiate, the target will die!
Edit: But that could be just one option of the game, you should be able to go into the settings under coop settings and choose an option that will allow "coop decisions", so that the other players that join your game will not have a say. Or you could allow "coop decisions" that will give other players a vote.








