I'm thinking this could work.
You could gain madness trait by doing mad things like speaking gibberish and hallucinating via drugs and thus doing weird and unusual things that will get you in trouble with people.
The payoff is you gain the madness trait which gives you a special type of perception in conversation and a crazed attack option in combat (as long as you maintain the madness trait)
=>You perceive which people are acting unusually and/or are distressed and bothered by trauma (sort of functions like insight). This perception would give you conversation options ie.
To a cheating husband:
[madness] Says something suitably mad that hints at infidelity
Husband response:
"Get away from me you loon!"
Panics and checks up on his wife which exposes his behaviour to the wife. After all if the local loon knows...
=>For combat crazed attack stance would grant you two attacks instead of one with a weapon at the cost of wearing your best equipped armour. (you might decide to wear a bucket helmet going into battle)
