Adding Sharpen enhancement with none selected

It would be great to be able to add a sharpen enhancementwith the option of none selected.
That way you could add a selection by brush straight away. This would eliminate having to go in the selection and selecting none before you can start painting in a selection from scratch.

Everytime I add a sharpen enchancement I have to wait while it starts to sharpen before I can remove the mask. Only then can I start a new paint selection mask.