First of many! I'm new so I hope this isn't a repost.
I know this isn't exactly game-breaking but hey it can be helpful!
When you're in a BG and get killed, there is a bit of lag between the time your spirit jumps out of your corpse and the time you get ported to the nearest graveyard. If you're quick, you can click the resurrect button and be alive instantly instead of sitting at the graveyard waiting for the timer.
This is great if you're defending a base and need to get back there to stop people from capping the flag.
Enjoy!