This night I woke up and thought about possibilites to have a material with 2 different sets of roughness and normal maps, one for a “brand new” object, one for an “old and worn out” one - within a material instance, having a slider for the level designer to lerp between both sets. Not yet sure if this works. But my next question was - why putting that double textures and lerp stuff into the final shipping material?
Looks like this “bake out” option is the answer… will go ahead and test. Just wanted to let you know, you guys at Epic are awesome and it’s fun to play with UE4 
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