DarthKermit: I thought of an idea: electric blankets can be quite risky with causing fires. If you had a dedicated circuit (I know, it would add expense to a house), you could use your smoke alarm rule to kill power to them. And any other appliances you deem to be risky.
Problem with that is once it gets to the point where the smoke alarm has gone off, it's probably too late for cutting the power to do much. It's already caused a fire. Suspect RCD devices would be more effective.