No, I haven't had an issue with egg quality. All Flock feed does have a small amount of Calcium in it, but not nearly as much as Layer feed.
I do provide oyster shell free choice, just place it in cup hanging in the run and/or scatter it. They pick up what they need.
You can also feed/give...
For me, the "easiest" thing is to just feed an All Flock type feed, this way you don't have to fiddle with separate feeders, buy separate feed. Everyone eats the same thing so they are happy too.