But you can already swing the left or right by just pressing the movement key slightly.
It's been done like this ever since Jedi Knight, that's like over 10 years now!
Using the mouse movement to determine swing makes the screen super erratic, can you imagine how painful it will be to watch a YouTube video with the camera being swing about constantly!
That's why I did it the tried and tested way.
For the extra moves there's only one button being used for Kicks and Shield bashing.