Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
WhiteTower: You need as many games slots as there are possible games to be created. On a tournament that has a max of 4 players per round, you'll need 3 free slots (single game between each 2 players) or 6 slots (2 games between each 2 players).
These values are maxed at 5 and 10 respectivelly. So, in case of a tournament with max 8 players per section and only 1 game between each 2 players you'll only need 5 free slots.