Wow, I hadn't heard about that yet. Seems like a good idea: every progressive warning sign needs a "Run Away!" setting!

Seriously, though, this looks like a surprisingly sensible strategy. "Extreme" just means extreme likelyhood of fire, whereas the new option adds the touch of we can't stop this one that has sadly been proven necessary. The alert levels and siren that go along with it are pretty much what the far North has in place for Cyclone warnings, so not too much extra confusion.