Hi,
It should be, yes; I just tested it and it seems to work for me in the simulator. Note that the hover effect is pretty subtle (and that’s not something we have any control over), and you have to be in the selection mode (leftmost icon on the lower right of the simulator) to see it when you mouse over an object. Also, the object needs to have a collider.
Technically, yes; you can set the scale in the transform of the volume camera, and the output scale will be its inverse: for example, if you set the scale to 2, then the output will be half as big. I’m not sure that this is intentional behavior, though, or that we will continue supporting it in the future. You might be better off just scaling the content in the usual way (parenting it to a single node and decreasing that node’s scale).
Thanks!
Scaling Volume Camera worked as expected 
How i can achieve UI Overlay behaviour in VR? I want to UI render in front of camera
You can use a world space UI, although that won’t always be facing the camera unless you explicitly attach/position it to be so. In unbounded mode, I believe it’s possible to use the device pose to accomplish this, although that may not be working at the moment.
Can you confirm if scaling the volume camera for Unbounded will be supported in future? It would be super useful to know this.
Yes! Apparently it was intentional and will continue to be supported.
@kapolka Thanks for that. I assumed we’d need to change our game to handle scaling, rotating, and translating - but as the volume camera can be transformed, I’m wondering if it’s a suitable mechanism to use at runtime.
However, looking at it, it’s very slow in the sim, removing and closing the volume, then recreating it each time it’s changed.
Is this as designed, and transforming the volume should only be done sparingly at runtime, if at all?
It’s not intentional; we’re aware of performance issues with volume camera transformations, and will work to optimize it in future releases.