RVR
Good point well made, lest we forget that to make any changes to the exams and test format would involve ALL member states, being as the UK is the only country to be more or less fully JAR compliant.
It is unlikely that the UK would make changes on their own.
Im almost sure instructors in the USA have to do 2 CFI exams, one of which is about the method of teaching and getting the message across and the other a technical paper that deals with issues pertinent to the kind of aircraft you will instruct upon.