If you use Capture One Pro, I am seeking your support. I have requested that PhaseOne add a filter for black & white images so we can filter to only see images that have the black & white tool enabled.
PLEASE OPEN A CASE WITH PHASEONE AND REQUEST A FILTER FOR BLACK AND WHITE IMAGES.
I did some reverse engineering of the database tables and found that the ZVARIANTLAYER table has a column called ZBWENABLED that is either 0 (false) or 1 (true). Adding this filter should be REALLY easy if people will just ask for it. More demand improves the chances that PhaseOne will implement it.