QTR-Quadtone RIP

Is it difficult to create split tones using QTR? 

I assume one would first create two curves, say warm and neutral, to
establish the appropriate settings for each curve. These would then be
"combined" into one master curve (the settings that is) with split toning
done by creating/importing appropriate Photoshop curves for the gray and
toners within that curve?

Thanks,

Terry.