Would love to have the ability to bake multiple materials into a texture sheet, so we can clean up imported assets easily and reduce files.
Essentially, a tool in modeling mode where it would discard all material data from an actor, bake it into a single texture (all colors and textures that are seen on it) and also create a single material that contains that texture.
In the tool options, you can choose to bake lighting or just the color (second is default) and also if you want it to be a duplicate, or delete the old materials and textures.