G-- Good news on all fronts. I tested, everything worked well with the fetch on the books I put in the expected folder structure. I certainly liked reviewing my first note (with all my tagging) in Calibre's preview pane. Very easy to see which books I've forgotten to tag.
I'lll look forward to the architectural changes. I have never let Calibre manage my books because of the mbp/tan file issue. It never caused me too much concern until I saw people so excited about re-titling all their books. I'm a worrier.
I think all of you have done an excellent job, except for that problem, so I'm glad you are working on it. I don't have a paypal account, or you would have had a donation from me. Good work.
(If I come here more often I am going to have to figure out how to do the quote thing.)