Using the color correct effect (the one with the color wheels for high/med/low) and the eye dropper tools, you can achieve the same effect. Actually you probably will get better color balance that way.
Low - use the add or subtract on a black shadow area or a color you want black.
Mid - use either eye dropper tool on a medium white tone or grey.
High - use either eye dropper on an area of white in your scene.
The RGB histogram will show you the color imbalance. The RGB peaks should roughly align, based on how much warmth or cool tone you want in your image.
Shoot a chip chart while you are shooting, and you can pretty much just eye drop the black/medium/white areas of the chart. You can use the crop/zoom tool to punch in on the chart to make it full screen. Then use the waveforms/histogram to level the shot.