I have honestly never see anyone have Word set up like that, but I am learning now that this exists. I do think having CIS set up like that is ideal, but that is just my opinion. Whatever the majority wants is probably ideal.
So you guys are typing up a word document with a totally black screen and white lettering? In all my years of working in offices I have never seen someone do that. If the white screen really is hurting your guys eyes that badly you really should hit up an optometrist.