This makes sulfur from Natura useless. It should be registered as dustSulfur.
Also, it will be cool to have "Cotton" and "Barley" in OreDictionary

Sulfur - registered as dustSulfur and used in recipes of Railcraft and Thermal Expansion.
Barley - registered as cropBarley and used in Harvestcraft. If Natura registers Barley it will be possible to create some food from Harvestcraft using Natura Barley.
Barley Seeds - registered as seedBarley and used in Harvestcraft. If Natura registers Barley Seeds it will be possible to create Barley Seed Bag from Harvestcraft Barley Seeds.
Cotton - registered as cropCotton and used in Harvestcraft. It used for creating strings but if Natura registers cotton it will be possible to create a wool from Harvestcraft cotton.
Cotton Seeds - registered as seedCotton and used in Harvestcraft. If Natura registers Cotton Seeds it will be possible to create Cotton Seed Bag from Harvestcraft cotton seeds.

For requests for adding things to the ore dictionary I would appreciate the names of other mods that use these other items