Do you actually have any code for us to help with or is this a request? Sounds like you're making a gamemode, and in that case you shouldn't mess with the prefs, and instead just update the team members' lives.
Yes, I am making a gamemode. I just needed a small script so that the main feature would work. I need it so that when the person on both "V.I.P." teams dies, their regular team has one life.