Grouping Players in Teams

Thanks for creating this module! I have wanted a tournament module for a long time, but haven't been able to work on it. I'd like to request some features that would be helpful for the tournaments I record:

Some tournaments require players to compete in teams and receive a team score. This adds a new level of complexity to scoring:

1. Players can be traded between teams.
2. There may be more players on the team than in the game.
3. Teams may assign positions to players.
4. Teams may replace players during a game.

The solution would be to have an unassigned player pool from which teams can draw, allow positions to be assigned to players, and keep track of player replacements during games.

This was my first look at the module. I apologize if these functions are already present.