Take a look at this and I think it will answer most of our questions or at least mine.
http://www.jeppesen.com/download/aopa/jan00aopa.pdf
I quite familair with the airlines that use the 1000/3 restriction in their ops. Saves training time and eliminates the circle from their ops, thus eliminating just one more hazard from the daily scheme of things. Not a big deal to have the restriction removed from your certificate and some airlines that use expats want to see that removed prior to getting hired.