Lightroom should have white balance sliders for shadow or highlight areas of an exposure

Great idea for the lightroom engineers and product development team. Create white balance sliders for the different exposure areas of an image. I am an event shooter and I love that I can bring up dark backgrounds. This of course happens from light falloff when I use my flash the background has a different exposure and white balance than that of the foreground. I can adjust the over all color of an image or use a brush tool to fix a specific spot of the image but it would be really great to use white balance sliders to adjust the different areas of an exposure especially that of the color shift that happens in a room where the room white balance is very different form my flash white balance.