To get an arbitrary camera angle, start the game with edit mode turned on. Then during a scene hit ctrl-F11 to pause, and ctrl-E to enter the editor. WASD keys to move the camera, left click and drag to change the camera angle. Ctrl-H turns off the HUD and the annoying editing highlights. If you play around with it some you'll figure it out.
One bug to keep note of, if you enter edit mode while in the first-person view your character will lose their head. Literally. Which would really ruin your screenshot potential.