Many, but not all, mods in that category are prebuilts - the ones that are should be using a tag called "Vbuild" that you can block if you so choose. I'll go through them and assign the tag (users can assign tags on mods, too, as soon as 3 or more people vote for a tag, it gets added).
I understand the use case for "World Saves", but I find it hard to come up with a solution that wouldn't just be duplicating the category name into a tag, which is not ideal. World Saves are also distinct enough to warrant their own category.
edit: it might make sense to add the "Save Games" tag to all mods in the World Saves category - as they are to an extent.