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.
I think there is a bug, and it seems to be recent and only applies to backgammon. Clearly if I lose to someone rated below me I should move down more than losing to someone rated above me. Note that in all cases the ratings are well established.