Again:
Could you look at the "Melee with Fire Weapon Input" toggle?
The currently working method is too fiddly, because when using quick melee, I end up accidentally using melee when I actually wanted to shoot, so that's a no-go for me.
A solution would be, to set another toggle / let the actual toggle be modified, which only activates, when you hold ALT to get the melee weapon right into your hands 'without a firearm in hand'.
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What also came to my attention is this:
The weapon itself can have Punch Through added with Mods, but no Punch Through is to be found on it's actual stats.
I've tested it in simulacrum and Punsh Through is not working on it; so… why?