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The sprint shifters plug into extra ports on the brifters, they don't work as standalone shifters. From what I've read they don't appear in the eTube program, so they're just peripherals for the brifters.
Has anyone tested this, though?
Dammit-
Carlton Bale says 'SW-R610 Dura-Ace Sprint Shifter: This is the only component using a unique wiring connector; it is only compatible with the ST-9070 Dura-Ace and Ultegra ST-6870 Road Dual Control Brake Levers/Shifters. Unlike all of the other shifters, the sprint shifters do not contain a circuit board; they do not show up as components on the CAN bus network. Instead, the sprint shifters are simple momentary switches that activate the circuit board on the host Dual Control Brake Lever/Shifter. The host dual control lever is what sends the shift command. (Note: Any momentary switch can be attached to the sprint shifter port on the Dual Control Levers by splicing into a standard EW-SD50 wire to act as remote shifters.)'
As yet, I have yet to find that Carlton Bale is wrong about anything Di2 related, and so for present purposes I'm assuming he's correct. If you'd like to try and prove him wrong, however, then get in there sunshine. Report back ASAP.
Brommers
The sprint shifters plug into extra ports on the brifters, they don't work as standalone shifters. From what I've read they don't appear in the eTube program, so they're just peripherals for the brifters.