Hello MMOC! Not sure if this is the correct forum, so I apologize if it isn't.

I've been sifting through the attic and found a 4 button Axtrom mouse. Was super excited to try it out on account of lack of comfortable keybinding space on some of my characters in WoW. I'm used to using a basic 2 button mouse. I move my character by simultaneously holding down both right and left click, so I completely rely on both mouse buttons for movement.

Now I have two extra buttons on the sides of my mouse to use! Unfortunately they only work when I'm standing still. So if I were to bind an instant cast spell or a spell that's useable while on the move, I need to release Left+right click (aka stand still) and then click on either one of the 2 side buttons. Is this typical mouse behavior? Or must I change something in my System Preferences/WoW settings for the side buttons to function while the main two buttons are pressed?

I'm using Mac OSX Mavericks.
Thank you in advance!