Adding bullet penetration to NPCs.

[PivMan]

So I'm working on a realism mod and would like to implement bullets penetrating through NPCs. I made it so limb shots have a heavy damage penalty so it's annoying when I miss a target's torso because the bullet just nicked his finger. I noticed that setting the projectile type from 'missile' to 'flame' made penetration work to a degree, but it screwed up the ballistic aspects of the bullet. So I want to know if there's a way to edit the projectile types themselves and give 'missile' the penetration capabilities 'flame' has.