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.