QTR-Quadtone RIP

Roy,

Last couple of weeks I have set up my 2100 with UT-3D inks. As basic 
curves I have now a warm, a cool (both approx. on LAB b axis) and a 
selenium curve (at LAB a axis). 

In theory I could make an endless amount of combinations with these 
three primary curves, each representing a cornerpoint of the UT3D 
color space. In practice however, QTR does not allow this freedom. 
Since I can only interpolate between two curves I can only create 
tones at the boundary of the color space.

For convience I made a neutral curve as well, at the origin of the 
LAB space. This allows to interpolate between the selenium curve and 
the origin, as such controlling the saturation of the selenium. This 
increases the freedom a bit. But if goes further down this road, the 
number of "auxilary curves" grows rapidly and these curves become 
more and more difficult to create.

It would be much and much simpler if I could interpolate between 
three curves iso only two. I envision an menu much like the channel 
mixer in Photoshop. Is this something you could consider to add to 
QTR? More than three doesn't make sense, since with three curves to 
pick one could define any colorspace one can envision.

Could you give this a thought?

Thanks

Joost