Ya, with social skills you want to keep in mind all the modifiers and the difficulty of what their asking.
Also keep in mind that a social skill is not a magical mind affecting spell, it has limitations. I can see convincing a man already contemplating suicide to shoot himself, and I can even see convincing a guard to wound himself when you're showing overwhelming force "So it looks like who put up a fight", but walking up to a man and saying shoot yourself does not fly in my game no matter what your dice pool is.
As humans we have this pesky will to survive, I've added a couple levels of modifiers to the social chart potentially Physically Harmful (-5), Physically Crippling (-8) and Lethal (-15).
Another route I've seen taken (and used a few times) for social skills, is using (despite the blatant rules against it) thresholds for opposed social skills. This is mostly due to the fact that it seems logical for it to be harder to convince a man to shoot himself than shred documents vital to his job. It is also useful for goons (I just buy successes on their dice pools and set a threshold for the roll to speed things along).
Of course you'll probably want to play a few times before you start thinking about house rules.
