Feather option for Clone brush

Would it be possible to add a Feather option to the Clone brush in Spot Correct?

I think this would be useful when using Clone because it would allow the edge of the cloned area to blend more gradually into the surrounding image, making corrections less noticeable.

I don't feel that the Heal tool needs this in the same way, as Heal already blends the correction into the surrounding area.

A feather control for Clone would give a little more control when doing precise retouching.