I can confirm that JAR FCL licence holders do not have to send their licence in to get ratings or qualifications added. The basis for this is that I did a night qualification last November, and when I sent in the paperwork, including logbook and application form but nothing else if I recall correctly, I did not send in the licence. I received about 12 working days later a new page for my licence book that was exactly the same as the current one but with the added "The holder can exercise the privileges of this licence at night," or words to that effect.