Agreed; I'd also prefer a deeper shade to the "off camera" strips. But for monitoring what goes off-screen, I prefer to use lit wireframe mode, with the window set to the rendering aspect ratio.  No "off camera" strips at all, what you see is what you get.

     For carefully placing point lights inside a candle flame, I use outline preview mode, generally switching among the orthogonal cameras (front, left side, right side, back, top, bottom).

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5