I am glad you are going to do the flag after manual curation. And by all means I am not saying that you are not free to use a flag how you see it fit.
What I am after is your reasoning for doing this project. Mostly because of the way you word things like in this post.
After reading it twice it made me feel like you are now giving people the choice to either accept your comments or to get flagged instead of the option opt out/never hear from again or accept my comments on your posts!
I believe that a good discussion is never wrong as long as both parties are willing to see the other persons sight.