Hi Michael,
Glad you were able to take some time to not only have a look at the website but also come back to me with your feedback.
There are many areas that don't get published. Things like concerts and fireworks areas, forest fire areas, temporary military missions, etc crop up on short notice. These are often away from airports, and as such are not associated with any particular airport NOTAM file (ICAO airport code).
Funny enough, part of my notam frustrations started here. Whenever restricted/advisory airspace showed up under the FIR, it was a painstaking process to determine if my flight would cross this route. This is the direction where I will be taking Zulu for Pilots. I'm in the middle of incorporating FIR & National notams. Afterwards, I want to see "shaded regions" on the map that depict both published and "last-minute" restricted/advisory airspaces. Finally, I would like to see a pilot plot his route on the map and see what notams are relevant to his or her flight.
So to answer your questions in your final paragraphs, the website's scope is limited to aerodrome notams only. However, FIR & national notams are #1 on my "to do" list.
Thank you again for taking the time for writing.
P.S. Maybe one day we'll cross paths on the radio - I've been wanting to fly out to the East coast for some time.
Adrian