I was wondering if it was possible to create traits?

If so, i was also wonderingif you can set a trigger or event that gives a trait.
What i Had in mind was the charachter that captures the egyptian capital gains a new trait... a Pharoah (sp?) trait. The trait would boost command, influence, management, resistance to assasination. Is it possible?

Could i make this hereditary?

Any help would be appreciated, thanks in advance.