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3- Global controls, such as the ability to turn on or off all shadows for all lights at once. That would be great for when you're worrying more about how your textures look than getting a real render. Certainly it would be much better than having to select each light and turn its shadows on or off one at a time.

You idiot, you can do that in Poser, right there in the render Settings Panel! You have to click the manual Settings button to get at it and check or uncheck the box labeled Cast Shadows.

OK, so scratch that one off the list. ;-)