> Um.  This seems like a very poor idea.  So, the user runs "shutdown"
> or "kill 1", putters around single-user for a few minutes, and permanently
> damages his hardware?  No thank you!

While I'm not fully enamored with the idea of using a user-level
program, I have to say that this is quite the strawman.  The kernel
could easily have a failsafe for "maximum cooling" if the user-level
program dies or does not respond.