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.
BBW: Ahah, yes, having different likelihoods is a good idea. If it's 50:50 then the game would be hugely luck-based and I would guess that the number of draws would be very high due to the lack of organisation. I'd suggest a percentage split of perhaps 70:30 with the 70 always in the direction back towards the slot that was used to introduce the piece.