Having a carpet.conf file in .minecraft/config that gets copied to the world folder when a new world is created would prevent you from having to change the same settings every time you create a new world (or having to copy carpet.conf from another world).

well, default carpet.conf is an empty file. If you change some settings permanently, the carpet.conf should be created.

Don't understand what is the problem here.

What I meant was that you could have settings that automatically apply as default to a world when it is first created.

For example you could define carpets as true in a file, and so when you make a new world, carpets will be enabled without having to do anything or change any settings. It would just be a quality of life feature.

I would also greatly appreciate this feature.

I agree, this would be beneficial along with default scripts.

Maybe copying a FabricLoader#getConfigDir/carpet/default_carpet.conf file on world creation (to state clearly that it is only a default, not global config, and the carpet suffix to allow extension's configs too and because it's the final file name)?

Relates directly to #211.