Black cofee is a great docco, but your right, not too much on the harvesting aspect etc.
Another good one is called Black Gold that I found online and downloaded. I am searching for it to purchase now! Its more on the Ethiopian Economic situation and how hard they cop it from the international markets. There are some great things happening there, and hopefully with their "UNION" they will be able to achieve some serious growth over the next 10 - 15 years!
When I did my course at the coffee academy at William Angliss in Melbourne, they showed a docco on the harvesting methods, washing methods (dy, wet, etc) but for the life of me I cant recall what it was called. It went into a reasonable amount of detail... More than Black Cofee anyway. Maybe drop them a line and they will be able to assist.
Hope this helps!