V-Ray for Rhino

If I render previews for my client than I like to use the JPG format, but it's cumbersome to choose file type JPG for every new rendering.

If I change small details at a scene after a rendering is done than I would like to start a new rendering without the previous rendering is reset and no prepasses are shown. So I could move the mouse to the interesting areas per "follow mouse" and...

Would be nice to have displacement vray , with triplanar mapping natively in grasshopper for vray.