When you equip the Goblin Rocket Pack for the gunship battle you can use it to jump over to the other factions boat, but what most people don't know is that you can do a substantial amount of dps with it. As a tank I am able to top the meters without even trying hard using the rocket pack.
The first useage of it is for melee dps or hunters (or arcane mage?).
What you do is use the spells in your regular rotations but you use the rocket pack while your sitting on the GCD which does 2000 damage per target for a small jump. It also slows attack speed of enemies effected by 20%.
The second useage might be an exploit, I'm really not sure.
It requires the use of a slowfall mechanic like slowfall, levitate, engineer cloak enchant). Since the more jumps you make the more damage you will do when you land, you can easily do 60k damage upon landing after floating around with a slowfall.
This is great for if you are assigned to stay on your ship as a melee and you have nothing better to do while waiting for the next portal to spawn.
Just watch at how much threat you do because if your tank isn't using at least the first technique then you will pull threat very easily.
I hope this guide helps some people with this fight.