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.
Stones on the intersecting lines - I think that is how it is done on other sites (like ItsYourTurn) - but it's been awhile since I played it there, but I believe that is how it is done there. :-)