Does the book "RTF Pocket Guide" tell you what RTF supports?
I also have a suggestion for a 2nd edition of this book. Why not include a bonus CD-ROM with print purchases with a sample document with ALL RTF-Supported features? As for PDF purchases, the sample file comes with it directly.
As you know, this book was published in 2003, and I believe since it's already more than 5-years old, I believe this would be a great time to revise.
This book has 4-star votes on www.Amazon.com, and I believe adding more content will bump it up to probably 4.5 stars. Who believes my prediction?