My players are really digging SF2 on our STALKER server. However, the mood of STALKER maps is a lot different from most gmod maps. Consequently, the teal hue of the daytime fog looks pretty off and as far as I can tell it can't be controlled in any way. I've included some screenshots.

Here's an evening thunderstorm: https://i.imgur.com/F1o1AtC.jpg
Clear night: https://i.imgur.com/9r0zYs2.jpg

Both look great in action. The fog/sky override colors for daytime, however...

Here's default clear day around 2 PM: https://i.imgur.com/ri6bwWY.jpg
Here it is with FarZ override: https://i.imgur.com/uPY6wPt.jpg
Here it is with fog off in the clientside settings: https://i.imgur.com/vcGp4Wb.jpg

There isn't really a suitable visual balance here. If the basic sky/fog colors could be manually adjusted in server settings, or even just have SF2 defer to the editor entities for color settings, it would be possible to adapt to a wider variety of map atmospheres.