Not sure if this is the right place to put a feature request or not, but if it is:
I would really really like to see the ability to have a RenderTexture that can render in stereo. That would make setting up portals in VR so much easier. Portals are possible right now (Rendering portals in Unity 5.4 with native OpenVR? :: SteamVR Developer Hardware General Discussions), but in a very convoluted way, and are almost certainly worse performance-wise than if a RenderTexture could be rendered in stereo.