FYI, I get them via the editor by dragging the whole tray of pieces onto the board as opposed to individual pieces. Simply adding a "w" (or any other character not representing a piece) to your FEN on the sqaure where you want the red dot to appear seems to work as well.
Sorry for this being in the box, dumb formatting mess :(
anyway, I get a "improper FEN" error...
cool thanks for the puzzle man!!!!!!!!!!!!!