If you create (there is a tool for that too) sphere in modeling tool it is not going to alter engine version. If you create (drop) engine version of sphere and model it - yes, that will change the engine version mesh. Modeling tool also has a UV adjusting thing. Anyway - making custom meshes with Unreal modeling tools can be as good as Blender if you know what you’re doing. In Blender I can make a cube ! Also, good luck importing it to Unreal 
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