I used something similar to this, only thing you need to worry about is laying down
caltrops against rares. If your really good at kiting then maybe switch smoke
screen out for something else, maybe pet or the rain of vengeance with knock back.
Can you set multi-shot as your secondary (right mouse button)?
This isnt as good until you hit 50 due to the passive that you need but find the Best 2h Crossbow you can get and spec this.
Smoke screen rune is preference thing, i just like having it cost less discipline
Stampede on rain of vengeance is great since it buys you time as the beasts will knock back almost all champ packs.
For boss fights, change impale to chemical burn and Rain of vengeance with w/e takes your fancy.
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