Win8.1 judder in landscape(flipped) [working WA proposed]

As I've mentioned earlier, I wasn't taking into notice WA's that are not acceptable from release application point of view:

WA proposed by others that are not taken into notice:
- Decrease resolution of primary monitor and force it to 75Hz -> Not every display can be bumped to 75Hz
- Set Oculus DK as primary monitor -> I don't believe any customer will integrate into his settings so much, it's to complicated for end users, then they need to switch it forth and back, Oculus should just work for them
- Disable other displays except Oculus -> the same as above

I've finally decided to try them as it looks like there is completly no interest in this issue from Oculus support team.

So here is solution that works, but it is dirty WA that is unacceptable for customer product release:
- Set Oculus in Extended Desktop mode to Landscape (everything is "upside-down" but we don't have judder).
- Now set Oculus as primary display.
- Detect in game that it is running on Windows 8.1
- When performing distortion rendering take into notice rotation by 270 degrees and flip everything with proper matrix, or even simpler, by adding this two lines in your distorion shader:

// Windows 8.1 flip fix WA
Position.x *= -1.0;
Position.y *= -1.0;

Your game will render correctly in 75Hz without judder now.
But as you can guess, now all your icons and start menu are on Oculus display, and all new opened windows will appear there as well. And as if there were not enough of bad things already, all that will be flipped upside-down.

I hope Oculus team will be willing to fix that quickly, or add proper OpenGL support to direct mode.