How can i acheive by scripting, or other means, to make NPCs after death respawn at their editor location (i think that means where they were palced in construction set) rather than what they usually do which is respawn at their last current location. Also, how can i choose to respawn them anywhere on the map (interior and exterior).

I don't know the answer but, in Mankar's paradise there is a guy that respawns when you kill him to a specific location. I would look there.