Valve should add the 3rd and 4th teams, Green and Yellow, as a mapmaker option in team fortress 2.

Valve should add the Green and Yellow teams as a mapmaker option in team fortress 2. People, myself included, would love to play murderball in team fortress 2. There are tons of other interesting possiblities, such as team deathmatch or team control point. In each of these cases, balance is perfectly attainable. In murderball, for example, the map itself is based around the concept of 3 teams ganging up against the team currently holding the ball. In addition, there have already been maps made that have 4 team bases! The only thing they lack are the additional teams themselves.