Other functionality

I hardcoded few things so now actually you can't change theme from dark to other, but you can try to customize it somehow either through app preferences or through reflhax.cfg and .gui/ > theme dark.txt

Shaders are available so you can change them too.

Additionally for 3D view if you happen to acquire a spherical skybox you can change the 3d view background, but keep in mind that without shader code change you will get mirror reflections.