I voted for I like this idea. The second one.
It was a hard decision between second and fourth, I'm sure.
But really, (at author) you just give a very vague reason for this suggestion. At what times could this even be applied? You are fighting your opponent until one of you are at -0 HP, and then there already is that command.
I guess it could be good if you make the command work only in cities so that you can't just use this every time you spawn in a bad place, but I don't see the point of it in combat.
Edit: Okay after seeing what vedaras said about the "TB trap", I say that it should only apply to a turn-based random encounter, no where else, if anything at all. Then again, why would someone go in a trap like that other than expecting to get spawn-killed?