Oh gosh, sorry, I feel like such a moron for apparently not reading the entirety of your post.
And as you can see from the screenshots my last post, I was successful in "reverting" that party dream world thing. I figured it wasn't necessary to revert the main menu's display, as only the junction/magic exchange screen need to show the passive characters. It was fairly simple, it's one of the many features of the dream world flag, and I just had to disable that (disabling the entire flag itself makes the game crash pretty quickly :p). That's why I used strikethrough on that edit: it wasn't relevant anymore.
You say it's just little endian (off course it is, it's a PSX game), but 0x007 PSHN L, with let's say a value of 3, is 03 00 00 07 unlike 0x128 RESETGF like I said which is 28 01 00 00. That's why I said it was confusing, the identifier isn't in the same place at all just because there's an argument, I'm suspecting. For the record, I prefer editing things live, because it is unbelievably faster to test than to open a program, edit, compile, restart the game (or at least reload the field).
Now I just need to somehow find all the pre/during dream world scripts and I should be good to go. Took me two minutes to find the first one hahaha, this is going to take a while.
EDIT: Derp, I just realized I can just memory search the Map ID.