I had an idea, and i'm sure I'm not the first, but i'm going to throw it out there. The emoticons for the d-pad are great (who doesn't love dancing), but I think that the d-pad is under-utilized.
My idea is this: When you have your ghost out (clicking the touch pad for PS4), it would be great if the d-pad worked as hotkeys. When your ghost is out: The up arrow switches between primaries, the left arrow switches special, down is heavy, and the right arrow could be hotkeyed to consumables (like ammo synths), it would save having to go into the character screen when things are going on.
I'm curious what everyone else thinks about this.
[Edit]
Thanks for all the responses, everyone! There are some good ideas and additions to this being thrown out there. Keep them coming!
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Overall I agree. The d-pad should be used for switching weapons within classes without hitting start and changing them at the least. If you had the capability of assigning the hot-keys yourself to what you want, even better. Using the d-pad for switching weapons and using ammo synthesis would be huge.