For Attributes, Rogues should pump Finesse.
In terms of Abilities:
- Scoundrel should go to at least 2-5 for skills (it depends on whether the Level 3 and 5 Scoundrel Skill sound appealing to you). More points into Scoundrel will boost movement and your Critical damage from backstabbing.
- Warfare will boost all of the Rogue's physical damage, even the non-backstabbing components.
- Dual Wielding will boost their chance to dodge Physical attacks in addition to adding damage. It doesn't take much to get dodge change up to 50% or more, although it will require more shopping for gear.
Dodge-based Rogues are better if your character is a Dwarf, because Dwarves get a free 10% more Health and a free +5% chance to dodge.