Alright. First off, for the textwarping. My current route involves doing that directly after getting the Harp. While a S&Q (Great that you figured out how that works, I was previously clueless) will indeed put me inside the wall, I can still let the Like Like grab me, which will also be faster than to use a S&Q anyway.
Planned route: Harp -> Warp -> Dance -> Bombs (There's a chest you can reach with pitwalking) -> Pegasus Seeds -> Bombflower -> Back to dungeon 2. This skips visiting the Mystery Seed tree (You'll recieve them at Crescent Island anyway). However, I don't know how this affect the Ambi's Palace cutscenes, if you are still able to the same glitch as you did. As I assume I still would have to watch the cutscene where you recieve the bombs first anyway? I don't know, will test :D.
Another location for Maple that I thought of, is when you have to use the switch hook on the seed in the mountain, before the mine cart minigame. Might be faster, unsure.
Nevet thought of doing D5 before D4 either. Saves a timewarp and the Cane could be used nicely in the dungeon. And for the D5 key skip, here is a method to do it without the Peace Ring:
http://dehacked.2y.net/microstorage.php/info/237507190/D5KeySkip.vbm
One of the biggest surprises in the run was the shortcut to the Zora's Village. I really didn't think it could be used in more places. Are there any others as well? Maybe in Seasons, hmm. I need to check :D.
Also nice that you improved that bossfight! I'll hopefully get back to this run soon, now with all the new stuff to work with as well. So thanks a lot for sharing your work, highly appreciated!!