Just an idea but what if hunters throwing knife was mapped to R1 and melee was mapped to circle, which means crouch could be mapped to r3.
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That is actually a minor annoyance I've found a tad bit... Well annoying xD I play with the "Green Thumb" layout with R3 as my melee and it sucks when I sometimes try to melee an enemy with the occasionally off chance I throw a throwing knife instead in the middle of the panic. I'd say double tap would be an option but just an idea .-.