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.
Have there been any complaints about unwanted comments on non-private games in progress? Personally I'd like all games to be public or at least the private games become public once they're finished.
One thing that comes to mind against that idea, is the starting positions in a game like battle boats, for example, that you should not be privey to, if the player chooses to keep them private.