In the OS X Print pane, when you set it to Black and White select "Save Current Settings as Preset..." from the Presets menu. Then when you go to print next time you can just select the Preset instead of going through the menus.
I'm not sure if you can make that custom preset your default, though.
I think I've tried that and it does eliminate steps (clicks). I've even created a couple of my own presets there (Fast draft, B&W; Normal draft, B&W...)
I was looking for a way to eliminate as many as possible though !