I know this already exists for elderly people and people with bad memory: a timer for the stove.

I think it is a good idea for every household.  Just press a button at the wall and the stove is powered for 1, 2 or 4 hours; should be enough for most cooking.

Never be afraid of having forgotten the stove turned on again.

The power cut off can (of course) be overriden when need arises.