Being able to set monochrome textures to be saved as RGB. And being able to pack them in separate channels of same file.
Unreal Engine 4 doens't support B/W texture files so it would be nice to be able to set monochrome maps to be exported as RGB. This way they could be directly imported into UE4 without having to resave them in Photoshop. Also being able to pack monochrome textures in separate channels of the same file. For example: Roughness in R, Metalness in G, Height in B and AO in A.