Team filling is that when you queue a game with 3 people in your party, you get one extra person to make it a team of 4. The ability to turn off team filling would be very helpful for more experienced players. Many games where I queue eggwars 4s with a team of 3, the player who is not in the party hurts the team by taking resources. So I suggest to make the option to turn off team filling for vip 1.