One of Paul Stamets' interns did an experiment with that. The results were very interesting. Pleurotus Ostreatus oysters did produce some mushrooms and had a slight decrease in quantity of vegetables. However, Hypsizygus Ulmarius White Elm Oysters had lots of mushrooms and had a definite large increase in the quantity of cruciferous vegetables, so that's the direction I go when I am thinking that way.
The best paring of oyster or other mushroom growing is with orchards. We grow two strains, obtained from Paul's company, around our pear and appletrees, there is a symbiotic relationship with the hyphae and tree roots that benefits both.
We are working towards growing other species as we get areas ready for them simply because we like a variety of mushrooms for cooking. Most all of our land has been inoculated both by mother nature and by us, with mycorrhizal fungi.
Now we are prepping areas for eating mushrooms in ground and I'm working on an area to grow mushrooms in logs.
Our end goal is to produce most all of our own food and to have some items for sale at the farmer's markets as well as our gourmet pork to chefs.