Okay, so this isn't major, and if it's a repost, sorry. I didn't count this as an exploit, basically because it's not. It's just a slight bug. If it is considered an exploit, Mods feel free to move.
I was on my Mage today, and when I joined LFR I had to port back out and repair. Well, they started it without me in there. After they killed Madness, I got the VP reward, and I wasn't locked to Madness's loot. So, if you are feeling lazy and don't feel like getting locked out of loot, go to kill Hagara/Deathwing, port out, let the other people kill him while you are afk, and enjoy your VP.
Another good use of this is if you want to run with your guild/friends and don't want to be locked on loot (so you can roll for them) but need the VP ASAP and don't feel like doing Heroics.