1. No, fear doesn't have a snaring effect. However, if the mob have very little life left, it moves slower.
2. I don't think feared targets are easier to hit.
3. I'm not sure if there are such info availible, it should be some old parser logs. And even if it is, pet dual wielding might not be exactly the same as in project 99?
4. They are lvl-based but some mobs also have higher resists to eg. fire than others. Someone else do the math
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5. If pet taunt works like warrior taunt it doesn't build up threat, it merely is a skill that, if successful, puts the pet a tad higher on the mob's aggro list than the player with most aggro. Not sure about this though.