I don't know of any script, but you can make those ENEX (entry/exit) markers easy enough. I have tons of them. Its allowed me to add many save houses, hotel rooms, even some offices.
I cant lay into all the details right this second, but if you can find the documentation on ENEX, it should be easy enough without scripts, unless you need scripting for some reason.
I myself used the Coordinate tool in Sanny builder to locate my position in game, then looked up my IPL and wrote it into the ENEX section of the IPL. (You dont even actually need to change the IPL ENEX; you can make one just for your own ENEXs). I learned from a document somewhere on here.
Theres a few tricks, like knowing where to swap coordinates, and distinguishing teleporting from exterior to exterior or interior, and flags for things like vehicles.
I'll try to find the link in a few minutes.
I think this is the last one I made. If I recall, it takes you from the outside of the building adjacent to LibraryTower in LS to the roof.
1499.9054, -1371.7406, 13.0216, 0, 1.5, 1.5, 8, 1501.184, -1371.6782, 13.0184, 270, 0, 66, "DT3HELI", 0, 2, 0, 24
1483.7373, -1354.3544, 162.2187, 0, 1.5, 1.5, 8, 1484.1216, -1356.1086, 162.2187, 180, 0, 70, "DT3HELI", 0, 2, 0, 24
Let me try to find that tut for you.
I think this is the one that taught me:
with some help from
Hope this gets you started. It can be tricky at first learning how it works, so that you can have a many markers go to the same interior and yet remember where to send you back to, like when you have many entrances enexs to the same burgershot interior.
Also, I found it helped to place your landing about half a unit or so above your position. I dont remember why actually, I just remember thats what I usually do. Probably something to do with not appearing in the middle of the ground or something.
I'll check back then later. Someone else probably has a more clear explanation, Im just a bit rushed at the moment. Let us know how far you are and what is and isnt making sense to you.
Here you can see one I put behind the World of Coq after I spruced up a condo in the back. It takes me to the Prickle Pine Savehouse interior and back.
A wider view