DefinitelyOkay so the only reason why this should be added is to respawn when stuck in the map.
How I think it will work best will be written below (by me).
I do /kill
I have to stand still for 1 minute. If I move, the command will be canceled.
(This is to prevent people from using it in the middle of a battle or game)
I waited a whole minute without moving so it kills me and I spawn at my spawnpoint.
I can use it again after 5 minutes.
smart idea about staying still to do /kill