I made two improvements to make using the "hammer throw" ability a little easier.
I added an alternative way of performing the move. Instead of moving the mouse in circles, you can rapidly press left and right (or 'A' and 'D') repeatedly a few times until the character starts to spin. This may be easier for some people.
I also added a projectile path display to help with aiming. It's a little imprecise, mainly because the character is spinning so timing can also affect the throw.
