Hi Dave and all:
It's really exciting for me to see these questions, because we tackled so many of them in the book. We cover in detail ginseng, and paw paw cultivation.
In addition to the book, our buddy Bob "Mr Ginseng" Beyfuss discussed Ginseng cultivation in a video series through the national extension network:
http://www.extension.org/pages/70054/youtube-channel-ginseng-series#.VBjeEUhRFSQ
With paw paw, both bareroot and seeds can be successfully grown. When you say you "didn't get good results," its hard to know why. Paw Paw needs well drained and uncompacted soil to do well. It also is a shade loving species, and young seedlings really need to be introduced to full sun environments slowly. Best is to plant on edges or where you get half day sun.
Both paw paw and Oak are tap-rooted species. Generally, tap-rooted trees are harder to transplant, especially when older than 2 years.
cheers
Steve