Would be nice I think, that in addition to the existing dialogue method, it allows the player to perform action related stuffs in the conversation as well.
For example, choosing one of the 'mood' will grant player opportunities to plant telephone bugs subtly in the middle of the conversation which is only available if the player manage to level up sufficient ranks in the required skills. Doing so will allow players not to require performing espionage mission to plant the telephone bug instead.
Another example would be the ability to possess photographic memory of the vital subtle information the agent manage to capture during the conversation that would allow players to have access to hidden maps, passwords to locked doors or safe ect.