Dross said:No, Sneak Attack Damage is added only once each hit no matter how many conditions are met. A Rogue1 would only get the +1d6 Sneak attack damage if she was flanking and invisible or scored a critical while flanking or scored a critical with Telling Blow.
It's in Champions of Ruin.Kabol said:theres also the Craven feat in .. LoM i think