Spiral Tool Preview Checkbox
Outside of using the default values for the Spiral tool, it's always been difficult to get real precision with respect to altering the decay while dragging and holding CMD / CNTRL. It would be super flexible if the tool had a Preview check box. Turning it on would generate a wireframe of the shape with the default values. Then we could try different settings to get the shape we want and then click Ok to produce the shape.