Thanks, and yes, I get all of that (although I did tear my hair out initially thinking that "anywhere on the neck" meant any string, any note on the neck, not just any fret...). I was just checking in case there was some hidden rule about 7ths that I didn't know, since I didn't recall it being mentioned when Lisa brought up the barre chords in Fundamentals 2.
"I got this guitar and I learned how to make it talk."