Digital BW, The Print

iProof PowerRIP will let you print combinations of color and BW.

http://www.iproofsystems.com/powerrip_2000_epson.htm

This little known RIP was the first I used to get neutral BW without 
metamerism from my 2100. It doesn't have a separate BW printing mode, 
but it seems to do the right thing and use mostly grayscale inks when it 
encounters grayscale values in RGB images. Some people here tried it and 
found the dithering too coarse, while others liked it.

It is slow because it requires you to use 2880dpi printing mode to get 
acceptable results. I also found that the dmax with this RIP was lower 
than with the Epson driver.

I've since moved on to the UT7 inkset using both the Epson drivers and QTR.

They have a free demo on their site which is fully functional, but will 
put a watermark on your prints:
http://www.iproofsystems.com/download/powerrip_2000_epson.htm

--
Daniel Staver
http://daniel.staver.no

> I had assumed that Imageprint would be able to do this.  My question
> was, for those of us using the Epson driver for colour, and QTR(Gui)
> for B&W, is a RIP like ImagePrint the only easy and reliable way of
> doing this?
> 
> You said "acceptable results".  Is this different to "good" results?