Is there a way to drag a selection and move it around while you create it? I know there's a program that supports this but I don't remember which. like some sort of a key combo. for example holding shift while sizing you shape keeps the aspect ratio and holding alt duplicates your sizing in the opposite direction. I would think that holding ctrl would let me move the shape around.
Hold the Space Bar down while you are dragging out a selection.
This works with the Rectangular Marquee, Elliptical Marquee, Single Line Marquees, and all the Shape tools.