@Tryn skyward sword is the only one where you can save and load files while doing bit; entering the file select screen cancels the glitch on ww and tp
plus, it's not useful in any speedrun categories for wind waker because the bit dummy file has no items. it skips a little of tp because you can use the dummy file's sword and shield (and ability to call epona), but that's still just saving the game normally, not messing with the save/load process
-F
@Tryn skyward sword transfers flags between files with wild abandon, maybe that's what your'e thinking of?
-F
@Tryn iwrc an old low% route actually required beating the game twice because you needed to get one file to the final boss so you could transfer the flag that the door to the final boss is open to another file
-F
Ah I found the video I remember seeing on the subject. I was thinking of the transfer of the boss flag but that just happens with resetting the game from within back in time, not from any saving/loading shenanigans.
@Felthry
Huh I thought at least in twilight princess there were some flags or something you could transfer to other save files. Maybe I'm misremembering how that works.