that would be just the best i believe, since for this matter its all about speed which the rendered view provides without having to render it. currently the glass looks basically like non existent. i have the feeling that was requested at some point.
@nathanletwory
after fiddling a bit i found that raytraced or rendered set to cycles could actually work, no idea why it is not functioning for a render.
still the main issue is speed, not a critique per se, but with the rendered preview i am so close to be ok, if just glass would look a bit more like glass.
here a simple scene, the first one the rendered preview, the 2nd image is now arctic since it seems to provide less diffusion for white textures which is ok, still a little darker less contrast in the light, maybe it would get there if i would let it render longer, but after 2 minutes i stopped it. also the ambient occlusion seems more crisp which is maybe also a result of not letting it run longer idk.

