1) a feature that wasn't carried over on this mod from going from 1.6 to 1.7?
2) a feature that was part of Ex Aqilio but not included in Ex Astris? Or
3) something on Harvestcraft's end when that was moved from 1.6 to 1.7?
You can always add your own "recipes" with Mod Tweaker. http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/wip-mods/2093121-1-7-x-modtweaker-0-6
Usually when someone builds a ModPack make use of tools like that to add the compatibility you looking for.