I often hit the edge of the map when scrolling around the battlefield, which is to be expected.
What strikes me as odd is that when I do so, the scrolling just stops, like I'm stuck to it. I'll then have to back away from the edge in order to continue scrolling around. It's quite aggravating.
Instead of just stopping, why not allow scrolling along the edge of the map? Think solid but slippery map edge.