I've never played a rogue before WoD content, so I'm wondering about the weapons. Can I play with a sword in the main hand, and a dagger in the off-hand? So I can keep both weapon skills leveled for when I decide whether to commit fully to sword rogue late game, or respec to assassin/subtlety rogue. I saw somewhere that a dagger or fast off-hand helps with poison procs while I would want a slower main hand weapon?