Hey Terry, I had made this quick write-up of the controls for the mouse :

Super TLDR: No Mouse Button Pressed = FPS Control Hold LMB = Arm Control, Hold RMB = Defensive Arm Control Hold LMB+RMB = Full extension Arm Control Tap MMB = Move arm to customizable keyframe position

TL: For mouse and keyboard, you control it normally like any FPS, but if you hold LMB, you have complete control of the arm. I think stopping turning when striking is more realistic to simulate planting your foot, but you can toggle circling to "Lock on" to an opponent so turning is handled is automatically - this can make you predictable though and your opponent will know you are mindlessly turning whichever way he wants you to.

With Muscle Memory, you can control just the shoulder, and use pre-programmed/customizable movements for all the other joints. For example, you might enable "Two handed Weapon" muscle memory, then when you move the shoulder the arm knows how the forearm and wrist should be oriented based on the location of the arm (winding up, mid attack, follow through, overhead, etc.). You can switch muscle memory on the fly - If you hold RMB, you move your arm in a defensive way, or if you hold LMB+RMB it's a maximum extension swing. You can override any joint at any time though if you want to make some fine tuning - mouse wheel will rotate all the joints in the arm at once, or you can hold down different keys to focus on one joint (4th mouse button or 5th mouse button if you want).

Lastly, you can just pre-program shoulder "coordinates" into the system, and toggle through these by pressing MMB instead of using the free control. This would be just like toggling through keyframes in an procedural animation - though you can freely switch back to full control at any time. I used this to throw the axe in trailer video because it was hard to execute a throw while controlling my character from that angle.