So originally I put this in ideas but I decided to recheck the guidelines just to be sure and realize this might fit here instead.
I was trying to go for the punch 500 enemies joker, but since I play on controller it feels a little bit cumbersome since you have to press in the right stick and hold it to keep punching.
So my idea would be like a toggle in the menu for the ability to press melee and you just pull out your melee (in this case you're fists) So then you would be able to use your melee with the same button that you would use to shoot your gun.