Sometimes when in the middle of a raid or a boss battle and you run out of ammo for your heavy or special, I find that it's a bit out of the way to go into your inventory and apply an [b]Ammo Synthesis[/b]. It would be handy if you could assign a D-pad directional button to auto-reload an Ammo Synthesis or at least have a function to customize the control of the D-pad command.