Currently, if you want to scroll around the tactical map, you need to zoom out, centre on a unit, and zoom in again. It would be more intuitive if running the mouse to the map/window edge would also scroll it, just as it does in the full window mode on the main map.
Or, you can left click and drag the screen. Zooming out, then in is a bit much. However, I DO agree with you that they should add edge scrolling to the tactical battles.
