First off, thanks, you cleared up a couple things for me.
As for the quote......you actually answered that question already. But what I was getting at was this;
Quake signed the Accords. As I understood it, that made her subject to their rules and regulation. She was also a SHIELD agent, subject to their rules and regulation. If she was already subject to SHIELD's law, then what purpose did the Accords serve?
But I get how it works now, I think. Not nearly as heavy handed as the comics version. Again, thanks.