Digital BW, The Print

Utilizing the Colorbyte Software ImagePrint 4 RIP I find that I have 
the option of printing with guadtone (hex) inks as either RGB or 
Grayscale image files.  That is, I can scan a negative in RGB mode as 
most people do, convert it to b/w using the channel mixer, but 
continue to save the image as a RGB file.

Can anyone see an advantage to this approach? I am not a digital-
techno-geek ;-) and as such tend to simplify thing photographically 
as to, do they work or not. Perhaps Austin or some of out 
other "engineering types" could provide some understanable 
justification either for against leaving files as RGB and printing 
them as such.

Mike