Can anyone tell me the controls for changing the view while looking at the render window? I just downloaded the G.E.C.K. I do know that holding down the scroll bar on the mouse makes the view move and scrolling it gets you closer to the ground, but what changes the diagonal of your view. If anyone could help that would be great.

Hold shift.

http://geck.gamesas.com/index.php?title=GECK_Commands