Ajax.InPlaceEditor.addMethods({
  createForm: function($super){
    console.log($super); // $super is not defined
    $super(); // exception, $super is not defined
  },
  enterEditMode: function($super, e){
    console.log($super); // $super appears to be the event object in this case
    $super(e); // exception, $super is not a function
  }
});