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.
It's totally illegal to play scrabble online without permission. That doesn't mean it isn't done, but it would be a big risk for a reputable site to take, hence it is not on yahoo! or Microsoft zone.
Changing it enough to get around the copyright is possible but likely would be unsatisfactory for true Scrabble fans.