I can answer 1 of your Q's quickly. To view notes that ONLY come from books/websites etc that are on YOUR bookshelf, go to My Bookshelf and scan down/click on Notes & Reviews. Hope that helps a little :)
I'd LOVE to see a filter on notes similar to the filters on recipes eg notes on recipes in my library that exclude meat or fish, or maybe that include, say, eggplant. Please can we have this.
I would like to search My Notes (under My Bookshelf) by author. Often I remember the author's name but not the title. And if I like an author, I will have many of their books, but I probably won't remember which one contains that wonderful recipe I made a few months ago.
While we are on the topic of notes, I'd love to be able to see at a glance that I have written a note on a recipe without having to open the notes. Like a different color or something so I know I've commented.
And while everyone is throwing in ideas, is there a way to pull up a book and see the most recent notes at the top? Sometimes I like to check in and see what things people have made recently and what they thought about them, to give me inspiration to try something new.