I might be biased, but I disagree that it's "just hacks". Certainly hacks are involved, but there are a number of best practices and methodologies involved in proper third-party scripting. Which are covered in the book.
I recently had the pleasure of hearing on of your Engineers, Ben Vinegar, speak at a Tech Talk in Toronto. My impression from the talk was that the hacks were perhaps the more interesting subject. I hope you haven't cut them all out of your book.
That content is still in there. I just don't want people to think of this book as a one-trick pony :)