grenv: why not have a simple rating for every player.
Moves / Game
then it doesnt matter quite so much how many games they have started. If they have 100 active games and make 200 moves that day, they score a rating of 2. (2 moves per game per day)
If they have 600 games and make 50 moves, they have a rating of 0.083.

Then set a tournament that only accepts players with ratings over whatever the creator sets.

This would not totally guarantee a specialist from screwing up the tournament but it would help a lot and certainly help identify slow players