Seems like Ogre3D 1.9 (this is what SR uses, right?) is quite well supported for the OpenHMD Virtual Reality API (http://openhmd.net/).
Right now it does not yet support the recently released consumer head-sets, but most developer kits & Google Cardboard is supported. Judging from their Github branches ( https://github.com/OpenHMD/OpenHMD ) Occulus Rift and HTC Vive support is under active development as well. OSVR should also work more or less already as it is very similar to DK2.
Their demo app is based on Ogre3D, so I guess this could be taken as a template for SR? https://github.com/OpenHMD/OpenHMDDemo
So anyone with sufficient programming experience interested in making a VR fork of SR? Could be a great way to gather some new interest by developers for making SR even better than it is already