Digital BW, The Print

Hi everyone, and thanks again, Clayton, for working out the variable
tone workflow for the R220.

A question for Clayton or anyone w/ experience with this setup:

I have been getting interesting, and sometimes pleasing, results by
working with files in RGB color mode and "toning" them in software to
print on an R220 with Clayton's suggested mix of warm and neutral UTR2
inks, except with a warm Y.

This promises to work better for my particular situation and needs
than does Clayton's slider-based toning workflow. The advantages I am
looking forward to are: easily saving toning info w/o dealing with
adjustment curves or notes, kind-a-sort-a-WYSIWIG plus fine control if
needed via R-G-B values, and potentially easy split-toning.

The question: what are the disadvantages doing it this way? I don't
see any reason why output quality would be any less in RGB vs
greyscale, but I don't know enough be sure. There must be other
considerations I've overlooked.

Thanks,
Bob L