Setting Team Limits in fretta

In fretta, i have set up 2 teams. How do i go about setting it so that team 1 has 4 players for every player in team 2, eg ratio of 4:1. Players can always join team 1, but only can join team 2 if the ratio isn’t less than 4:1. I have almost managed to do this but im still having some issues. One thing i can’t figure out is disabling the button to join team 2 when the conditions are not met, all i can do is deny the request after it has been made - which works but looks bad because it seems like you can join the team, the button isn’t greyed out. Any help will be appreciated and if i wasn’t clear, please tell me what you would like me to clarify. Thanks.