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.
Vikings: of course. But fast players, may want to check their opponents "speed" before accepting a game with them. Heck, it may even be a filtering factor when creating a new game "Accept only players that make at least 1 move per day"