I experimented a bit to see how and why the classic cursor isn’t working. I already known that the fact the screen was devided by 2 would cause the problem. But here are some explanations.
So what we have here, is the game image on a flat screen. The red square represents a widget button.
So here no problem, we just have to click it.
Then we have the Stereoscopic 3D version of the render. What i though at first, is that we had to click either one of the square. The fact is that the cursor can only be on one eye.
I removed the lenses of my DK2 to see what was going on, and i discovered that even if the game is rendered in Stereoscopic, all the interactions are virtually on a flat screen. It means the red square on this image is at the exact same position as the first, non stereo render.
I hope it can help