As for feedback - any chance you can tell us how to create our own rigs? For example I have bought character in marketplace that isn’t rigged to UE4 Manequin. I’m trying to do new rig but I don’t know how to connect bones…
Another thing is how to create rig for not humanoid things - for example fpp arms.
Edit: I haven seen Control Rig tab in Skel Mesh Editor. This resolve first question. Second thing for arms is still open 
What you could guys try is to grab some marketplace character - for example Goblin - which is humanoid and try to make rig for control rig using it. I have failed. Right hand and left leg are broken.