One thing you can do to really help quail is to plant an improved and aggressive variety of partridge pea like they sell at Roundstone. It keeps finding a way to come back year after year - even when perennials start to take over the ground. It can also be easily brought back by light disking if it ever needs it.
I think most biologist who have experience with it would tell you that it is almost the perfect plant for quail because of:
1. Abundant tiny seed which quail relish as food.
2. Good cover - 5 or 6 feet tall for the improved varieties.
3. Excellent survivability for an annual plant.
4. A forb that doesn't get choked out in NWSGs as easily as some.