The dedicated B&W inkset approach I use and advocate is based on my observation that most people cannot profile a system that uses more than a single bluish "toner" to cool the naturally warm carbon.
The first few paragraphs of http://www.paulroark.com/BW-Info/ explain the "Variable tone" B&W approach. The range of the inksets are from carbon warm to neutral to cool; no weird colors can be made because the toner "hare wires" the color blend.
FWIW,
Paul