Pen based interface for a notepad - Patent 7032187

Summary:
Selection / Highlighting - proximity of the pointer to the object and orientation of the pen.
Tools / icons - located on the side of sheet - fades away when the pointer is moved away from it - moves to the front when focused on it.
2 types of navigation - page based
dog - ear pop up for prev next page navigation - a folded page like interface is provided on the bottom right corner of the current page. The shadow of the fold (prev page) and the fold is the next page.
multiple page stack - the pages are listed on the right side bottom vertically similar to the alphabets on telephone directory.

Discussion:
The mode switch seems to be nice idea. But there would arise certain conflicting cases where the mode switch was done wrong. How would the interface react to such wrong recognitions?
How intuitive is the mode switch based on the orientation of the pen? How can the user identify this feature? I believe this interface depends on the user's adaptability in this case.