imo: You should make two settings within tennis. One for publics, and another for "proper matches" ie wars. So you could have the break option in wars, but not in publics, to avoid them being abused. You could also do the "Time please" option. In tennis there is a limit to the amount of time you can ...
There is a central database for the game StrikeForce, that is not "official" (ie not made by the SF team or integrated into the original mod by them). It's a mutator that tracks the stats of people by the names they play, and keeps a cumulative score. Some php/mysql/etc monkey could make it work ...