Cool, but why is there no setting to change the length/radius of the gradient? The "radius" slider only changes the contrast (but curiously only in radial mode)

Cool, but why is there no setting to change the length/radius of the gradient? The "radius" slider only changes the contrast (but curiously only in radial mode), not the size. Bug report: The color up/down thingies become stuck so that any mouse movement will change the value. (Chrome 15 on Lion.)