Fix-it Tools
The Clone Tool
The only awkwardness using Camera Raw is that if you want to have a color version of the same picture, you have to duplicate before you do the conversion. In Lightroom you can make virtual copies, (you are essentially duplicating the sidecar .xmp file, and Lightroom manages the different corresponding files virtually.)
The Healing Tools
The Healing Brush
Spot Healing Tool
You should always apply the "develop" changes you want to the color version before you do the black & white conversion. This includes input sharpening.
The Patch Tool
In Camera Raw HSL/Grayscale panel there are a few more sliders for more control. They are: Oranges (affects mostly skin tones), Aqua (sea water), and Purples.