we all know the pain of balancing games like this please add a numeric label to the slots. slot 1 gets number 1, slot 2 gets number 2, and so on, so you don't have to count every time you want to switch two players for balance
I agree, but more things could be done too. Like adding the rating of the player next to the spot they are taking in the map preview (map preview would most likely need to be larger though), or at least the total sum of the rating of both teams' players so you dont need to do the math yourself every time.