Editing itself directly not per se, but Cycles knows how to render panorama that can be used as equirectangular environment input for skylight. So you’d use a HDRi image you like, but you’d want to add some elements, like lighting, or block parts. So you set up planes/surfaces, give them shaders as you want them, position a camera at 0,0,0 correctly oriented and render a 360° panorama and save as EXR.
So at some point we can have that capability in Rhino, but not at this very moment.
Here some old crystals by @DavidRutten using Raytraced (Rhino integration of Cycles in upcoming V6, can be tested in Rhino BETA): Material preview crystals
/Nathan