My understanding is that the FAA were very receptive to the idea, and a delegation from the JAA went over there, but they shelved it.
Mortenb - I can assure you there will be times when you wished you'd studied that little bit harder and/or remembered it! The JAA stuff only looks extreme because they want you to learn it all before you start, although I grant you the exam system is a disgrace for all nations concerned. Possibly 10% of the stuff you will never use, but I have used most of it, sometime.
Any professional in any industry should be on a thirst for knowledge however trivial. An FAA or Transport Canada commercial checkride is on a par with any JAA exam. Takes longer, too.
phil