If you're a BM hunter and the WPVP WQ is for Black Rook Rumble, you can stand just outside the gates that you use to teleport out of the arena and send your pets to attack people in the arena.
You can also be other classes and stand on the gate and get credit for people killing others in the arena.
Only caution is that you can still be attacked through the gate, you can get death gripped through the gate, and you can be attacked by people who leave the arena and stand right next to you.
You can always take a few steps back and go neutral again.
Hope this helps!