I quite often just move the envsphere back (away from the camera) on its z-axis to achieve an effect approximating this.

Reducing the scale of the envsphere, from the default 100%, to say 10%, only makes a slight difference, I've found... although it can have some effect.

I suspect that scaling the envsphere on just its z-axis (or the axis receding from the camera) might have a similar sort of effect... although a slightly different effect at the same time... not tried this last idea myself yet.