Hahahahahhaahhaa, I just had a funny thought.
Wizard: >threaten dialogue ( Int 16 )
" If you don't accept my peaceful proposal, my painful spells will surel convince you! "
Barbarian: >threaten dialogue ( Int 7 )
" I hurts you until screaming!! "
...I'd like this. Except the wizard calmly and politely explains his opponent how the wizard is able to bring about *insert the opponent's worst fear, which the wizard easily deduced with his genius*.
Unfortunately, I think Larian is set on "don't change dialogue, introduce RNG-based checks which anyone can attempt".