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.
But I'm not a big checker person, so I'm not sure exactly what would be wanted. Took a look at IYT, and they have 22 different checker markers to choose from (that includes different type of markers and different sizes)
... plus it's not to difficult to put a symble for "parachute", and "queen", or something else if needed.