I am curious, what kind of enhancements can be made ? Are we talking about emphasizing a certain color, or adding sharpening effects or something else entirely ?
You have complete control over -
*curves - including individual RGB/CMYK curves, you can click a point anywhere in the image and the pixel value of that click will then appear as a editable point on your curve. And curve points do respond to arrow keys, so very precise adjustments can be made.
*histogram/levels - with mid-tone and endpoint controls, viewable in f-stops, RGB values, input/output values, and per individual color channel.
*color correction - global saturation and (somewhat) selective color editing control. The selective control works great for blues and greens, not so selectively for yellows/browns/reds. However, if skin tone is paramount and totally accurate colors outside of the skin tone aren't important, it's great for custom tweaking of skin tones. The selective color is not in the current Phocus beta, but I'm told it will be back and improved in a future version.
*sharpening - standard sharpening tools similar to photoshop's unsharp mask. But you can also limit shadow sharpening and you can customize sharpening amounts per individual RGB channel.
All of these functions are combinable and savable as a "recipe" which can be batch applied, or individual settings can be saved and selectively batch applied. They can also be applied on imported imags automatically on the fly as they import as well as when shooting tethered.
There are also controls for color temperature/tint, exposure, and a selective shadow masking tool (the shadow mask tool is not in Phocus - I am hoping they include it in a future version release.)