Currently, a great workflow for making details is making T-splines in Rhino, then exporting the box mesh into an OBJ file. Import into Mudbox or Zbrush to make tons of quick nice details. After that, export back again into OBJ in low res in order to import back into Rhino and add engineering details.
This function and the align/snapping function is the only thing stopping me to completely changing my current workflow... Fusion 360 has lots of promise so I hope it can be added soon. But great job so!!!