It's behaviour 2, actually. If you don't want these guys to respawn, you have to decide that by altering the lua script (like checking for a face etc.).

If you want random locations, you can simply choose one at random, the lua script can roll a dice:

from GameInit.lua:

function InitNPCs()

	-- Add the pilot at a random location!
	if is_networked == 0 then
		o = math.random(1, 4)
		if o == 1 then