Executing foes. A player controlled difficulty curve?

[Vandala]

I've for the longest time wanted to be able to just kill those downed enemies, it just helps with speeding up the game, but I understand why you wouldn't, after all if you can do it then why would the enemies not do it to you as well? (ignoring the fact that lots of enemies do exactly that.)

What if we approach this thing from a different angle, what if you did have the ability to kill a downed opponent, and the game tracked if you did so, and there was a threshold where if you did it enough times your reputation/infamy regarding executing people became known by the NPC factions and they started doing the same thing in return?

Now you have a sort of difficulty slider that once triggered will make previous foes that didn't care wither your characters lived or died after a fight execute your characters once they are beaten.