Here you go another UE4 material for you guys. This material provide s two methods for roughness and two methods for bump mapping one from normal and one from diffuse color or height map. It has separate functionality to control Diffuse UV than lets say bump map, for instance you can tile diffuse 4*4 and the bump map 2*2 or you can control the both at the same time. It also provide Fresnel functionality.With this base mat you never need to create another material from scratch, all you need to instance and adjust as you need.
I just finished working on a mel script to convert other render engines shader such as mia mental ray and maya native shaders to arnold
aistandard shader with the node connections like bump and color map. here you can grab it from here.