Don't raise and/or release pen raised pheasants or quail. Been there. Done that. What usually happens in my experience is that the pen raised birds, no matter how well managed, tend to be easy pickings for predators. Over time they will draw increased predator numbers and then when pen raised birds are gone, the increased number of predators are left to prey on the wild birds. My experiences have always led to decreased number of wild birds. My time and money has always been better spent on enhancing habitat for wild birds.
If anyone is interested I can post a quail management calendar on the wildlife management forum. It's a timeline of habitat projects you can do each month to improve your quail habitat. I put it together a while back for our local Pheasants Forever chapter.