In my case, the two left buttons are set for action shortcuts 'urgent' (ie repair, recharge ...) and those on the right serve me to adjust the dpi (ie accuracy for sniper mode).
One of the buttons from the center allows you to change mode (mapping shortcuts) to easily select specific settings to another game: 3 profiles can be stored, indicated by different colored lights, they even adjustable ...
One of the best rappoarts Q / P for FPS mouse! For mmorpg, other mice are adapted meix in my opinion.