Enhance sky - sunset by David - more control?

[Michele Burt Profile]

I love this effect, (Enhance sky - sunset by David) and wondered if David or someone could please create one that gives more control over the area ie move the effect up or down in the image. Sunset & Sunrise ehancer -02 is great too, but you can't mask or adjust where on the image its applied, only the border is adjustable.

I'd be grateful someone could please create an enhancer like these that is adjustable/controllable in position, intensity etc. Thanks so much!