we actually came to the conclusion a page or 2 back hat it is possible to change it to something other than r, g, or b, you just have to point the call to another number. currently one of them has to be atleast 1.0, but you could point that to a space that contains a 0 and use all zero's for black
i haven't tried it out yet as i've ben busy with other things, but if you can find numbers you need you should be able to get any type of color combo