You could run a WRGB device fairly easy using the DMXModel because it lets you define where the red, green, and blue channels fall and then you could just use channel 1 for white and type in 2, 3, and 4 for the RGB channels. It would allow you to drop On and Colorwash effects to activate the RGB channel or you can use the DMX effect to dial in any channel. Name the channels in the model definition and the DMX effect will show the names on the sliders.