One thing I like about like about animation part of scenegraph is the Trigger classes that acts as glue between event listeners and Clip.
My favorite example is the mouse over effect like in the following code:
Clip clip = Clip.create(5000,contentPane,"background",bgColorSrc,bgColorDest);
MouseTrigger mouseTrigger = new MouseTrigger(clip, MouseTriggerEvent.ENTER);
This work perfect on any AWT or Swing component, but I miss a SGMouseTrigger, that allows developers to add the same functionality on any SGNode.
A related question: Does Triggers exist in JavaFX Script language/API?