I dont think RWG does support more than natura and few more mods.
From his thread:
Supported by RWG: Biomes 'O Plenty, Thaumcraft, ExtraBiomesXL
Compatible with RWG: IndustrialCraft2, Tinker's Construct, Luckyblocks, Mariculture, Harvestcraft, Chisel, Railcraft, gregtech, Botania, Applied Energistics 2, Ars Magicka 2, Battle Towers, Wild Caves 3, Buildcraft, Forestry, Project Red, Underground Biomes,
Compatible but requires config editing: MineFactoryReloaded, Mo' Creatures
Not compatible: Better world generation 4, Alternate terrain gen, New Dawn
I edited the post. Apparently the mod isn't RWG, but rather RTG. Thanks for the info though. If I ever wanna make a pack I'll keep that in mind.
Quote from Orthoclase
Um, I played this modpack 2 months ago and was overloaded with chocolate quest dungeons, the modpack creator would definitely add support if there is none already, maybe you just got unlucky?
Ughh that kinda sucks. And to confirm you were using realistic world type and not the default BoP?