In real life when you want to fight somebody with a knife, you would hold the knife with the blade down, not up. So why do these expert warriors hold the blade up life a first-time thug? It would be cool if they held the knife right, and the animations for the attacks were changed. BUT when the player wants to slit their throat while sneaking, it still makes sense to hold the blade up so that they can slit from the right side moving left to right. I think this would be a good way to feel cooler too as you pull out your dagger after you run out of arrows or magicka, or you simply sneak around with your dagger blade-down. I think this would definitely be a good mod idea, and that other people probably wouldn't even know they wanted this until they saw it on the Nexus.