I've just pushed a commit to Github that fixes the issue where Toast could not be used with certain effects.
Here's a new example of using the Move effect class to have a toast slide up from the bottom edge of the screen when it opens, and it slides back down when it closes.
Toast.showMessage("I am a toast", 4, function():Toast
var toast:Toast = new Toast();
//you can set these effects in the theme, if you prefer
toast.openEffect = Move.createMoveYFromEffect(stage.stageHeight);
toast.closeEffect = Move.createMoveYToEffect(stage.stageHeight);
Notice that it's using a new openEffect property that didn't exist before.