First I have to say that I don't own a Deck Keyboard but most likely I will buy a 82-Key in the future.
I don't have this problem with the Ikari Laser, neither at home (SteelSeries 7G, Razer Tarantula) nor at work (some basic Dell Keyboard).
The Ikari Laser is detected by the OS as Mouse and Keyboard because it has macros (saved on the onboard memory) but doesn't have a dedicated driver and only uses the basic Windows Driver.
That's because not at every LAN-Event (Pro-Gaming) it's allowed to install drivers. I don't know if there is a other way to use macros without a specific driver.
That problem has nothing to do with the Ikari Laser being a Laser Mouse (Ikari Optical doesn't have macros), Windows doesn't even know if a Laser or Optical mouse is plugged in.
In fact there isn't a real difference between Laser and Optical mouse besides that Laser mice use a Laser-Diode (VCSEL) to illuminate the surface instead of a LED, the sensor itself is pretty much the same. Although the sensors of the Ikari Optical and Laser are from different manufactures and work quite different (different IAS).
Maybe I find the time to discuss this issue with the SteelSeries R&D Manager.