But ColorShop profiles allow us print B&W directly from RGB source - they produce great RGB composite B&W prints without the need for making grayscale images, which is far not as simple, as press "convert to gray" button,
I see! So you're using a profile to fix what sounds to me like a workflow problem. I think the better long term solution would be to look at your workflow (your front end software that you're using to feed the Noritsu) instead of using a wonky workaround. The right workflow software will let you convert images to grayscale easily and perhaps even tone them slightly. Printing everything with one profile is nice and simple and avoids complication and mistakes. Lock down your color management so you can forget about it and spend your mental energy on the workflow.
Minilab mentioned in my question is Noritsu :)
Good stuff. Would be interesting to know which one and what software you're using/they're using to feed it. Smart minilab workflow is a beautiful thing when it's all setup right. Scott Martin Onsight http://www.on-sight.com