All other similar apps (e.g., Google Books, Amazon Kindle) opens the book when you click the book icon. Mango shows a pop-up dialogue every time. Given the fact that the majority of time when the user clicks a book icon, he wants to continue from where he left last time, doesn't it more sense to use "continue" as the default action when the book icon is clicked, and show that detailed pop-up dialogue when clicking some kind of menu button for the book (e.g., three-dot at a corner)?