I made this corridor yesterday, so yes, it is still small. But the upcoming pack will have lots of parts to construct a level. So I want to have several rooms and corridors.

There are shadows as you can see behind the big pipes. The small lights at the bottom don't cast shadows to save performance.
And yes, there is a static flag for lights in C4 to not calculate shadow volume each frame. Such optimizations could make a difference. We will see.