I like the idea of a mouse scrolling method for the battlescape, that's certainly something that has been long missing.
to me, however, your way seems counter-intuitive: for mouse-scrolling I would always assume that it works as though you are grabbing the landscape and pulling into a direction by moving. your way is exactly the other way around: you hold the mouse, and when you move the mouse, the landscape is moving into the
opposite direction. this behavior is more like the middle-mouse-button-directional-scroll function that you can find in adobe pdf viewer and most browsers (you know the one where a circular "anchor" with four arrows appears where your pointer was, and when you move away from that "anchor", the image starts scrolling in that direction?).
for me, it would
feel more logical if the landscape moved as if you were dragging it. just my gut, though.