Yes, that's a good idea actually. I would also like to keep the full functionality of the controls. I will edit these points into brackets and will mark them as sketches. My only thinking for disabling leaning in FPP point-shooting is that the player could be trapped in the point-shooting mode when encountering an enemy. I thought pressing L3 would be intuitive. On the other hand one would develop muscle memory for toggling L2 to cancel point-shooting. It's difficult to tell without testing.
Concerning changing perspective, maybe holding L1 + pressing up on the D-pad in neutral stance could feel good. This way players could change perspective on the fly in game.