OK, I don't use a graphic tablet, but the mouse usage with the automatic shift makes me not happy, but if it is ok for the rest of users ... ;)

I would prefer a fixed relation between mouse movement at my table and viewport postion. Waiting of the automatic shift and don't know where the current position is (I tried to move the viewport between two objcts) makes me feel confused, my brain has no feeling for an automatic shift but a feeling for the movement of my hand/mouse.
It could be nice to toggle a view option for classical and automatic shift. I like the Rhino behavoir, that the mouse can be moved outside at one side and it come in at the other side, the relation between mouse movement and viewport movement is fixed and I can feel "my" position at the virtual space.