So as you know, if you stay in the spawn in all of the Warzones for longer than a minute, you'll be booted by the deserter detection. However, if you go into the tunnel there is a spot where you can avoid it.
Stand in the same spot as the picture, and when you jump, the leaver detection is reset. Get a macro/script to jump for you and you're good to go. As you can see in the image, the game has started but I have no deserter detection debuff.
I'll be checking the other Warzones for similar spots and will add them if I find them.