Seems that when you have two players in the same team, the following things cannot be tweaked (from my investigation at least):
- Turn off player HP on the left
- Turn off players seen through walls
- Enable visual audio indication for other players
- Cars with a player inside are indestructible
- Can’t slide kick players
All these things seem to have no setting to control when you are on the same team, and it adds so many gameplay issues.