Good points, especially on head movement. When I heard UFC3 would have mobile head movement I imagined we'd be able to sustain head movement like irl. Like you said about crouching, this is exactly what I am talking about.
We should be able to move and hold our head in place if we want. Right now the only way to sustain a lean is while planted, but if you move and sway your head will return to the center all the time. We should also be able to switch stance mid sway.
Also I found out that
R1+LS flick gives you micro lunges. If you do this towards an opponent trying to push kick you- you stuff their push, you can do this with minor lunges towards them too. It also allows you to no sell strikes with some seems like less of a hit reaction.