i played around with it some more and added in 2 color bars and a sky/cloud image. The bars were to help me gauge were the horizan was at. The sky picture i used because of the dark part and the brighter part. Like BB said you cant scale the  enviro, but you can twist it or rotate it so you can use what ever part of the pict you like best behind your models. I believe it also adds light into the render ??