I created a canny a long time ago about how to fix fog on avatars in worlds. These settings only need to apply to avatars, not worlds.
Someone was saying that these settings being forced on for worlds is increasing the world size and making worlds take a lot longer to build.
I dont know if this is true, but, if it is then these setting should probably be forced to "automatic" for worlds, and, on avatar, forced to the current open beta SDK. If this isn't true, and it doesn't really change much on world build time or size, please comment and close this canny!