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.
There should be a feature where you can open a separate window specifically used for game analysis, where you can move the pieces around and see what happens looking ahead before making your move. It's already been done on gameknot.com. It would work much better with In-Game Javascript as I suggested!
thechosen0ne: I like this idea. As a chess player I tend to set up a physical board to do analysis, but this is tricky for Grand Chess where I don't have a 10x10 board at home!