RGBW LED fixtures with Hue & Saturation

I'm using several LED RGBW Washes and I am wondering if there is any way to modify how Hue, Saturation, and the Color Picker interact with RGBW fixtures. I would like the ability (as an option) to make 0% saturation be only white at 100%, so that color mixing would in effect be similar to subtractive fixtures. 100% saturation on the other hand would have 0% white and 100% of Red, Green, or Blue. Is there any possibility of this in the current software, or interest in making it a possibility in the future?

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