Hey, StuntmanDYOM here.
SA Teleporter is a trainer to teleport around. I've edited the place.ini file inside the original to have all of the interiors in SA so DYOMers can browse through interiors fast and teleport to interiors which you can't teleport to using DYOM(Liberty City, Rosenberg's office)Some interiors are not solid so you have to place a random object under your feet like a gate or garage door in order to stand(because they're made for cutscenes, But some are solid too even if they're cutscene only, like the Angel Pine trailer or Truth's Motel room. but the un-solid are for example Ken's office, Woozie's FDC Room, A large part of the VC Stadium. It's just some you can stand on some you can not.).