Nah, you're not anal, just a Noodlehead. But hey, it was only $10, and it is pretty intuitive. Way better than some of the free Applescripts out there
I found one additional copy of the file that is made. If in iTunes Prefs>Advanced>General you have "Copy Files to iTunes Music Folder when adding to library" checked, then you'll get a copy in the usual place: iTunes Music>Artist>Album. Surprising that it will make up to 4 copies. Hope you're not tight on HD space.
I think they could enhance the preferences and the help menus but its not bad so far.
When you talk about the finish button are you talking about the three tabs at the bottom? Cover, Chapters, Finish. Maybe if you think of it more as a tab or final step then it won't seem so much like something that needs to go away. Personally I think the Build Audiobook button should somehow change once you've built the book. Then again, it
does have drop down that says your book is complete. Sometimes I click ok, then get distracted by something else and when I come back I can't recall if I built it yet or not. The only down side to that is that if it changed or became unavailable (after building a book) that might complicated things if you want to edit the chapters and rebuild the book and it said you already had and couldn't. Whatever. I still think its pretty cool for $10. I really dig the sound effects when its done something