The rod softfreeze is pretty old, it was the first useless thing we found with the rod in 3ds, before we turned it into a stick. From my knowledge you can simply use any warp song after stealing the rod and it gets enabled. Maybe even just enter a new area, but I'm not sure about that.
And are you using the correct seam at gerudos valley? If you're climbing the one to the left of the entrance from hyrule field, then it's the wrong one. I tried to climb that one for days without success.
You're suppost to climb a seam that is to the right of the bridge, next to the ledge.
So it seems that the seam to the left of the Hyrule Field entrance is, indeed, impossible to climb. I would use the one to the right of the bridge, but it's so risky!
I'm pretty sure most (or all) of this is old, but I'm gonna go ahead and post a list of places that I've managed to enter using a variety of techniques:
-Child Spirit Temple (Hookshot Clip as Adult Link. Pretty sure this is the only one that is loaded before you enter it, enemies and all.)
-Deku Tree (Hammerslide version as Adult Link. Use the sprout on top of Saria's House.)
-Water Temple Main Room (Hookshot Clip from the room with the waterfall and the hookshotable platforms. The area does not load, but neither does the water. Not sure if that's useful or not.)
-Deku Tree Main Room (Hookshot clip. Hook the vines on the left from within the Compass Room. The room doesn't load.)
-Partially loaded BF of Deku Tree (Hookshot clip. This one's pretty interesting. Hook the vines that lead to B2F from the room with the bombable walls and the crawlspace. None of the actors load, so this really doesn't do anything, though.)
Other Stuff:
-Actor Duping in Dodongo's Cavern four times will crash the game unless you remove some of the actors before the fourth dupe.
-In original Ocarina of Time, there seem to be some items in Bottle Adventure that affect the values of in-game variables. I've come to this conclusion after using Big Poe on B and Cojiro on C-Right. Before the RBA, Navi was saying her typical "Let's go to the Spirit Temple!" quote. Afterward, she said "Impa said that the Spiritual Stone of Fire is located somewhere on Death Mountain." I already had all the Stones and Medallions, even after the RBA. Before that, I was using Bottled Bug on B and Cojiro on C-Right and beat the Gerudo Archery game once (Heart Piece reward) with that set-up.
-You can Hookshot right through the walls of Jabu-Jabu's Belly, but I don't think there's anything you can actually hook in there, which really limits the use of this.
Questions:
-How do you use the Hover Boots to reach the Graveyard cliffs? I saw CloudMax post something about it earlier, but I don't think it was ever elaborated on.
-Does collision data for torches and chests remain loaded even after leaving a room? I'm pretty sure that torches don't and chests do, unless the chest must be made to appear by a puzzle.