Using the CH:olc() command we can script olc editing if desired.

Let's set all rooms in Bastion to be no_teleport.

For this script, we will not use a trigger, but instead use the 'mprun' command to run the script on ourselves.
So we just need an mprog vnum and we're good to go. I will use my favorite one, which is 31404.
<code lua>
local rooms=mob.room.area.rooms
local cnt=0
for _,room in pairs(rooms) do
  -- Maybe it is already no_teleport, need to check.
  if not(room:flag("no_teleport")) then
    goto(room.vnum)
    mdo("redit")
    olc("room no_teleport")
    olc("done")
    cnt=cnt+1
  end
end
sendtochar(mob, "Updated %d rooms\n\r", cnt)
</code>

Remember that since you are using mprun, 'mob' will actually be you in this case.
In our script we choose the area based on the mob location, so need to make sure we're in Bastion when we run it.

<code>
goto 10204
The Palace Square [Room 10204 city]
  You stand in the common area of the walled city of Bastion.  Shops and
buildings line the streets in all directions.  Some distance away, in the
four cardinal directions, roads meet the square and continue outward into
the rest of the city.  Looking up you see a complex system of support beams,
columns, and stone work that supports the "floating palace."  This palace
earned its name long before the walls of Bastion were built, when the palace
seemed to float above the rest of city and was visible from anywhere on the
island.  In the four corners of the square you notice spiral staircases
leading up into the palace.  The square is paved for pedestrian shopping
with white marble tiles, decorated in the patterns of the island.  Under
your feet in the center of the square is a great gold seal, and the donation
pit is through a hole down from here.  

[Exits: north east south west up down northeast southeast southwest northwest]

mprun 31404
Running mprog 31404 on Ranglor(0) in room The Palace Square(10204)
Room flags toggled.
Room flags toggled.
...
...
Room flags toggled.
Updated 275 rooms
Mprog completed.
</code>

Now, if it worked right, we should be able to run it again and have 0 updates.

<code>
mprun 31404
Running mprog 31404 on Ranglor(0) in room Before a Shadowed Throne(10505)
Updated 0 rooms
Mprog completed.
</code>