All you need is to check the traits and ancillaries files which have also the triggers that make your king dreadful and authoritarian.

Example from export_descr_character_traits.txt file :

;------------------------------------------
Trigger agents8
WhenToTest LeaderOrderedAssassination

Condition MissionSucceeded

Affects AssassinMaster 1 Chance 100
Affects DeceiverVirtue 1 Chance 5
Affects StrategyDread 1 Chance 50


... and for the sabotage thing I found only this trigger (notice only 5% chance to increase dread) :

;------------------------------------------
Trigger agents17
WhenToTest LeaderOrderedSabotage


Affects Despoiler 1 Chance 100
Affects DeceiverVirtue 1 Chance 5

I also found a website about this on other posts : http://noctalis.com/dis/totalwar/ (the links you need to check are at the top of the website)