Mike, did you notice that you rotate "the other way" from the built-in app? You rotate 90 degrees clockwise, the built-in app rotates 90 ccw.

Also, the zoom button seems really hit-and-miss. It will work for a while, but if I go to the menu or go to another app or something (still haven't figured out a specific, reproducable set of actions), the + key stops working and I can only zoom by going out of fullscreen and using the zoom button on the toolbar.