In Killzone they had 4 extra actions binded to the PS4 controller mouse pad. Swiping left, right, up, down. I don't understand why more games don't implement this into their games. There are your 4 extra customizable hotkeys. They should add 4 new bindings for the swiping left, right, up and down, and let you choose to put synths or emotes in.
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Well nevermind. every other console, new or old, would be left out. Nevermind. Just answered my own question. PS game developers don't use new console technology if it is a multi platform game. Stupid.