To insert a second sun in your rendering click Lighting, Add, Parallel. This is a very similar light source to the distant source in AccuRender 2. You can use parallel light sources to backlight objects. When using this source as a backlight, people often turn the Brightness down to .4 and the Shadow Darkness to 0.
When you add a parallel light source, the location of the insertion point does not affect the direction of the light source; it is only used as a placeholder for the parallel light source. You define the direction by entries in the dialog box.