Very nice work!
I have one suggestion. I've been using one version of full screen patch that has a button support for pen mode. Using this button, I could switch back and forth between panning and pen input mode. To me (and I believe to many of us reading A4 technical papers), the most important functions are 1) panning mode 2) pen input 3) full screen. If this combination can be mapped to buttons, it would be very very useful.