Reviving this old thread, in light of the new script decompiler (thanks troflip!).
I found that in Conquest of the Longbow, you can get a teleport screen at the start of the game by creating an empty 799.SCR file.
The game also check for the existence of an external "magic" script 800.SCR, but since it's nowhere to be found in the internal resource package, I can't test it.
I'll update the wikis later.