Another way to avoid a Sky DOme is with a Reflection Map, that actually makes use of Poser Sphereical mathematic(Like as if a Sky Dome were present,) though this is'nt as accurate/actual as it does not use Raytracing. 

Lets say I have a golden reflective material, and a bright blue sky; well, after raytracing, this equals green metal ;  P!  So to keep my blue sky, and make my gold very vivid; I take the textuer I would use to make the Sky Dome yellow, and plug it into the Reflection node(of the reflective material)  That will override a reflective material's looking for Raytracing...Really simple to impliment; but lets see some Material Room Screenshots!