Here is the true secret to filling the DPS slot:
Keep Righteous Fury turned off. Now before you all start yelling about me not making any sense, that it's always off anyway and that I'm an idiot wasting your time - the reason I give you this tip is that it's going to be very hard to get used to not having it on, because to DPS you are going to be speccing Protection.
1. Spec Prot
2. Wear full strength gear
3. Get a slow hitting, DPS 1h (see enhancement shamans and frost DK weapons)
4. Wear a spell power shield
5. Stand next to your tank in dungeons, and ACT like you are tanking, using all the moves you would normally use to hold threat (including HotR, Avengers Sheild, SotR, Cons and Holy Wrath) EXCEPT for your taunts and again, keep Righteous Fury off.
6. Get in top of DPS
Thank me later friends.
Disclaimer: mostly a parody thread but upon reading it again this actually sounds like a really good idea...