On the battlefield, you can change the height of the camera, as well as track it left-and-right across the field. On both the battlefield and main map, the zoom goes from way-way-way-in to way-way-way-out. ('Scuze the technical jargon there, but I can't remember any specs on exactly how far in or out.
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The space-bar pauses things for a moment during battle, which is a great aid in getting the camera positioned as you want. It is very easy to see everything, either with a wide-open eagle's eye view or by going right down in to almost bump heads with the troops.
Re: tac battle viewing options
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