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: Yes but I play 20-30 games at a time and not all of the same type. This is because I have other things to do. Some people seem to play 24 hours a day and have 1000 games going. These people have an advantage.
I would prefer that ratings degrade with little or no activity, that would solve the problem you correctly identified.