Not sure how simple or complex this would be to program, but it is DEFINATELY destructive.
The idea is pretty simple:
Have the mini nuke fire, with blast and all the same, but bricks are killed instead of fake killed, and the bricks directly around the blast that survive burn with a fire that spreads, identical to the firefighting mod's fire. This idea would make the mini nuke start to act more like a nuke, and cause far more destruction that either could separate!