another message, oh well.
Just played around with an image while surfing something else.
Try being inventive, try using tools for things you wouldn't. Sometimes it works, other times you end up in a mess. And most importantly, ALWAYS work on a a duplicate layer with the original unselected in the click box.
With the working layer duplicate it. Next, on that layer find all edges. Using the Hue/Saturation tool or Black and White desaturate the layer. Double click the layer and change the blending mode to Color Burn, you will notice that you have exaggerated edges, simply reduce the opacity until you get the desired result. Bit messy but you can go in and out of the dialog, deselect the layer and note the result, then reselect the layer noting the result. You want to see an increase in sharpening without a halo effect (which in this case will be darkened edges).
This will work on an image that needs fine edge sharpening, which most photo's could use as a first step (I always apply a 0.3% Gaussian Blur after this then flatten all layers so I can then work the image)
There are probably some other creative ways of achieving a Fine Sharpen.
Enjoy