I suggest to make the player character always attempt to look in the direction of the camera while holding right click regardless of if the mouse moved or not while using standard movement.

Explanation:
One of the key reasons to NOT use standard is because it can be difficult to attack while looking away from the target. The suggestion is always to use legacy and strafing while facing/moving away from the target, but many players still prefer standard because they can move non-relative to the camera.

Standard players can still achieve the same result of attacking while looking away by shaking their mouse while holding right click and looking away from the target. The issue is that your character only tries to face the direction of the camera while holding right click IF the camera angle changed/mouse moved. Running away while holding right click, but not moving the camera/mouse, and attacking can lead to you suddenly running towards the boss instead until the mouse next moves. Even knowing this, you may find yourself running back towards the boss for a split second, and this can be very annoying. Having the character just always try to face the direction the camera is facing while holding right click would remove the need to shake and remove any chance of running back towards the boss in a situation like that.

Alternatively, I think it would also be cool to have a movement mode where it uses legacy movement while holding right click and standard while not holding right click, but at least having this change to standard would be amazing. This change also shouldn't negatively affect standard mode in any noticeable way as I can't think of a time where someone would want to right click and not change the way their character is facing.