The Radial Blur has two modes, Spin and Zoom:
It has at least one interesting use:
If large Zoom blur is passed onto a simple cross and the result duplicated and randomly rotated, then an effective sparkle shape can be made. This can be used 'as is' (e.g. to add a bit of glow to a light bulb) or as a brush (e.g. to add some funky stars to a starry sky).