Is it possible to make any weapon crit on headshot, or is that only possible for hits an weapons? I'm trying to make it so the spy knife registers a backstab if it's a headshot, so how might I do that? Also, is it possible to make non-spy weapons or even projectile weapons capable of backstabs?
(I know you can make guns able to headshot - see ambassador - but I haven't had much luck with melee weapons)