GUI Config

GUI Config is a handy way to change configurations in-game, which is supported by Minecraft Forge.

You can access it by getting into Modlist on the main menu,

search for Stellar Sky among the mods,

and clicking the config button on the bottom left.

Then you can see how it looks:

Three main categories can be modified via GUI configuration. (Per-dimension category is included in Server category)

Click the categories to view the properties and subcategories in the category. You can change fields on each property to change the settings.

Here's how client category looks like:

Here's how server category looks like:

And here's how per-dimension parent category looks like. You can see categories for each world.

So here's the example per-dimension category on overworld.