Yes, the original posters question is one that be answered with a yes, and it's practice is certainly intriguing. There are some permaculturists in Lancaster, PA who are teaching an advanced PDC on this very subject at the moment -- zone 4 permaculture. Check out a summary Ben Weiss & Wilson Alvarez's work here:
http://www.thepermaculturepodcast.com/2013/restoring-eden/. They are working on a book. Kyle Chamberlain in Washington state is also working under a very similar permaculture model. See his blog, the Human Habitat Project:
https://sites.google.com/site/humanhabitatproject/.
Other good resources on this subject would be M. Kat Anderson's great work Tending the Wild, which describes native american indigenous land management practices, which were large scale and all over, in contrast to the "garden plot." I would also recommend Samuel Thayer's works on foraging, since knowledge of foraging (as well as hunting) opens your perspective to the possibilities of wild food, and once you can reliably identify wild foods it's a much smaller leap to begin cultivation of wild spaces for the purposes of increasing the abundance of the already present wild food species.