Cycle style V-Ray Frame Buffer

I like the idea of a “frame buffer” or an “image tool” (like that of V-Ray or RenderMan) that allows you to position the camera in solid mode while being able to see the render in a new window. Maybe the user can right click on the viewport render button to choose between the regular viewport render or a “frame buffer”. Another thing I would like to see is the circular bucket render (like the 2.79 Hilbert Spiral or that of RenderMan RIS)