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I'm not sure, I'm reading that the d7000 doesn't have a pc port. You need a camera with a pc port for what I have in mind. Can the cyber commander be used off of the hotshoe? A pc port or 3.5 mm? If so, you can leave the sb-900 on the camera, and stick the cyber commander on the flash.
I've done this with a Canon 5d, a 430exII, and some cactus v5's. The 430 is used for af assist in my case. A pc cord from the camera triggers the cactus v5 attached(taped, glued, velcro, bungeed, etc) to the 430.