My usual lighting does not work in the preview renderer anyway, so I use test renders for that. I prefer working in the "hidden line" mode while posing and putting things together. But that's just me, I fully understand that you want to get closer to the final result in the preview, and it should work anyway.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.