There is no problem at all keeping roos with your hens as long as you have the correct ratios. Too many roos and you'll likely have fighting over the hens. You can eat the quail eggs that have been fertilized, but you should collect eggs at least twice a day. Quail are quite productive when it comes to eggs. My son got to eat quail eggs for the first time the other day. He is deadly allergic to chicken eggs and developed a similar allergy to duck eggs so all that is really left for us (that is a quiet breed) are quails. He told me those were the best fried eggs he'd eaten in a long time! No reaction. There is a lot of "talk" out there so it's best to consult experts about what to do and what not to do.
Enjoy your quail. I'm starting out myself and can't wait until my first set hatches! I've done a lot, I mean a lot of research and this was a concern I had to.