I wish I could answer that question as of 2007. I worked on this back in 1996-97. All I can say is that at that time our problem was that other countries in fact allowed all of these games to be played. So our firms would have been at a serious disadvantage if we had closed the thing up tight.
The real issue here, and it's on the tax haven side of it, is that unless collectively the European Union, the U.K., the U.S., ourselves, Australia, and the Japanese really went at this full bore, it's very hard for any one individual entity to go at it because they then make it difficult for their folks.
I can't answer your specific questions because I am now ten years out of date in terms of what goes on. You really should ask the Finance officials on that.