Well, we can agree to disagree I suppose.
I don't see why any supernatural creature 10 refresh or higher would have any stunts.
Stunts are specializations that people/creatures have to overcome obstacles or be more powerful. If you can already shrug off rifle rounds and turn into mist, what use do you have for stunts?
I wish to preface this post with a disclaimer. I do not support munchkin behavior in my games, but I think it is wise to be good at it so one can counteract it. I also generally agree with what Bumblingbear posts. I like the cut of your jib sir! That said... stunts can stack with powers to make PC's into genuine pwnsticks.
We have an ogre in game who took some stunts that truly help him out.
-1 Was that supposed to hurt (endurance for defence)
-1 improvised weapons (use improvised weapons with fists skill)
-1 homebrew stunt (vehicular manslaughter) when using a vehicle as a weapon (melee or driving it inflicts two more stress)
-1 killer blow
think about how much stress a ford taurus turned projectile would do when combined with killer blow (since it now counts as a fist attack) + supernatural strength
costs no mental stress
add wall of death and weapon focus and weapon specialization to Thomas or Lara...scary.
Stunts can totally pimp out/munchkin/minmax a superntural critter.