skipinnz: in Fischer's clock games, there is no last possible moment to move - the time you have is for the whole game, not for the move. But as Dolittle pointed out, this discussion is a bit off topic...
All I want to say is that if you don't want to play against slow players - don't play against them. Brainking offers many possibilities to choose how and against whom you play your games. That is no argument against a speed rating or such. This is just a reason NOT to limit anybody. As mctrivia said: I payed for unlimited game slots. And I won't give them away because some people complain about some slow players. If you don't want them in your tournament, make your tournaments private! Marfitalu does so, he organizes huge invitational tournaments - it works perfectly!