i've drawn an ellipse sprite and added it to the display list of a container, which is added to the display list of the stage. to move the sprites with the keyboard arrows, it appears that my shiftModifier:Number variable is not working when the stage's display state is set to full screen. shiftModifier works as it should when the stage's display state is set to Normal.

stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyboardDown);

function onKeyboardDown(evt:KeyboardEvent):void
    {
    var shiftModifier:Number = 0.25;
    if (evt.shiftKey) {shiftModifier = 10;}

    if (evt.keyCode == Keyboard.UP) {ellipse1.y -= shiftModifier;}
    if (evt.keyCode == Keyboard.DOWN) {ellipse1.y += shiftModifier;}
    if (evt.keyCode == Keyboard.LEFT) {ellipse1.x -= shiftModifier;}
    if (evt.keyCode == Keyboard.RIGHT) {ellipse1.x += shiftModifier;}
    }

fsm.addEventListener(MouseEvent.CLICK, toggleFullScreenMode);
function toggleFullScreenMode(evt:MouseEvent):void
    {
    if (stage.displayState == StageDisplayState.FULL_SCREEN)
        {stage.displayState = StageDisplayState.NORMAL;}
        else
        {stage.displayState = StageDisplayState.FULL_SCREEN;}
    }

full screen is tested in Safari and Firefox.