In your Db go to "pvpareas"
The area # and name is on one side, the status is on the right.
1 = alliance, 2 = horde, 0 = neutral
I belive there is a special area faction for GMs. I saw it on another server but it migh've been some serious c++, it made it so everyone was allied but GMs had everyone set to yellow.
For a list of zone ids, Click Me