I was in a group to farm the Goblin reputation in the Saron PIT, when the heal and tank just deconnected after 15 minutes...
I'm playing a hunter and during the reset (when the heal was oom) I saw the reputation was always given when all the mobs directly died by the reset!
At the end I was alone, and I needed 6k reputation to be exalted! So I tried to pull the boss and reset it just after the pop of the mobs in the cave!
Well it works, each time you reset you will be given 150rep for the mobs in the cave!
What you must do:
0. have cleared to the last boss, or make your way to it
1. have a class that can go out of combat
2. pull the boss
3. run to the entrance of the cave and wait for the mobs to pop
4. do some AOE on the mobs, only to tag them not more (as a hunter I put explosive trap where the mobs pop)
5. go out of combat (Feign dead as a hunter)
6. profit of the free 150 reputation
7. wait some seconds for the boss to pop, and restart
Happy reputation
EDIT: this was in normal mode, dunno if Heroic gives more reputation