With Backburner you got a nice option that turn all other renders interruptible. (I know that deadline doesn’t need to be like Backburner !!! 
)
It’s a state higher than priority 100.
It will be very useful for emergency.
You gonna hate me 
For this situation, we recommend creating an “emergency” pool, and assign it at top priority to all the slaves (back at Frantic Films, we called the pool “crisis_friday”). If a job is an emergency, you would submit it to this pool.
Note that this does not interrupt any tasks that are currently being rendered on the slaves. If you need slaves to pick it up immediately, you can send Cancel Task commands to slaves from the Remote Control right-click menu in the Slave List in the Monitor. Note that you have to be in Super User mode to access the remote control menu.
Even though this requires some manual work, we feel this is better than automatically interrupting jobs because you can choose which slaves to abort their current task. You would hate for a slave that is an hour into rendering a frame to be interrupted. Spread that over a few slaves, and you’ve flushed hours of rendering down the drain.
Cheers,
- Ryan