ValhallaGH
Explorer
To me a rogues sneak damage is simply his ability to put that (dagger) in a vital spot to do great damage to that target.
I vastly prefer the model of Sneak Attack shown in the new Sherlock Holmes film. Calculated, precise combination of attacks that render the target incapable of further action; further, the precision requires the target to be distracted, as a fully aware opponent can interfere with the sequence enough to prevent his destruction.
And yes, Holmes used it in close combat. That doesn't mean it is restricted to close combat, simply that it is viable in close combat.