Harley,
I understand that when the "new" legislation was being sorted out, it was decided that the area-specific guides was a better approach than trying to make an all-inclusive single guide. I am not certain that this approach has worked as well as it could do, partly because each guide still has to cover a very wide range of buildings.
There has therefore been no official commentry written on the RR(FS)O itself. Basically it says "There is a 'Responsible person' for every building/facility/workplace/site open to the public; that person will carry out, or will arrange to have carried out, a Fire Risk Assessment (FRA) and will see that precautions are carried out to reduce the risk of fire as a result of that FRA."
So attention has been concentrated on the FRA and educating people in carrying these out and implementing any findings therefrom. There is plenty of guidance available from people like the Fire Protection Association
www.thefpa.co.uk www.mid-career-collage.ac.uk etc. either via courses, publications or DVDs.
Once 'case law' starts coming in from court cases it may be that someone will put together something on the RR(FS)O as a legal document.
There has been quite a bit of discussion in this forum about aspects of the Order as well, of course.