aNiMaL: If you open the tournament that you created then you can see Signed players and by the side of this list you see "Remove player:". It is easy to remove or exclude players but I recommend to use this droit very seldom. F.e. if you see a danger of deleting your tournament! http://brainking.com/en/ReadBug?bgi=1061 - this bug maybe not solved.
If you like fast moving players then it is better to vary your time control. I like to create my tournaments with Fischerś clock http://brainking.com/en/FAQ?ht=24 - it is good to play fast and don´t bring a timeout if you some days have not access to internet.