how to change melee weapon's physic impact force?

[j3lly0m3lly]

i know that you can do that easily for firearms by changing projectile's "impact force" value, but how do you do it for melee weapons, since they don't use projectiles?

[RayoftheSun]

You might be able to do this by creating a magic effect with an enchantment that applies some force effect when hit.