This product is problematic, and unfortunately...Corsair support just goes immediately to replacement rather than passing on our information to the experts. We'll just have to do the best we can here.
First off, and as a tech professional, there isn't anything wrong with your ST100 hardware-wise if it's connecting via USB and lighting up. I began noticing problems with mine immediately as well, and these problems could be fixed with the proper drivers and firmware if they ever cared to update it.
I had similar problems as you. However, I downloaded the corsair utility engine, updated it, and was able to find some tweaks. I couldn't get the color RED to stay on single...but I could get it to pulse red (good enough, I guess). And the RGB rainbow seems to be the default setting UNTIL after you log completely in with Windows 10. (Honestly guys, we can do better than this.) I moved my VOID dongle back over to the PC rather than on the ST100, and the headset works totally fine.
However, the biggest problem for me came with gaming. If I start a gaming session (say on Destiny or Overwatch), after about 15 minutes the ST100 just cuts out and starts reconnecting/disconnecting every 15 secs. Seems to be power draw related, as these games are graphically intensive. But I can't be sure. I've tried multiple USB ports, multiple USB 3.0 to micro cables, and multiple computers. All produce the same result.
Add to it the fact, like you said, there isn't even a section in the support categories for this product...means that its either so new that they haven't gotten to adding it yet, or that it doesn't sell well enough to merit its own section, or worse...that they just DGAF.
Either way, I'm pretty close to being permanently disappointed in Corsair products because of this. Which is a shame, bc I've been pretty exclusive on my Corsair peripherals for a number of years now. If any rep from Corsair reads this, the ST100 is currently a very disappointing product, and we need you guys to properly support it.