Fixture Color Calibration

Is there a way to customize the color space for certain fixtures - primarily custom and generic profiles, so that the output of the fixture more closely resembles the position on the color picker? 

Also, I have an LED Decoder and strings with RGB, White, and Warm White LED's. I patched them using the Generic LED RGBWwCw profile. The warm and cool white aren't mixed in by the console when using Eos' color tools, and Magic Sheets don't even show those colors at all. For Example, if RGB were all at 0, the fixture appears to be off in the magic sheet, regardless of the state of the warm and cool white outputs.

I understand that the process for calibrating fixture profiles is complicated and relies on data from the manufacturer, but it would be nice to have the option to tweak it independently so that it was at least close to the expected color.

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