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.
The current multi-game tournaments are nothing more than a bit of syntactic sugar to create multiple tournaments with the same settings. For instance, if one were to create a "backgammon variations" tournament, it will give 6 different winners, not a "backgammon variations champion".
I think it would be nice to be able to create tournaments where people played their opponents in all of the selected games.