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.
coan.net: Personally, I'm not big on the speed rating idea. BUT, I think it would be SO innovative as I think we would probably be the only turn based site with such a thing. (At least the only one I know of) So, it might be worth the programming time.