@auem:
first about your second point….what Naruto remembered when Bee told him about the bijuu bomb was his fight with Kyubi...so essentially that was the first time he saw it,which support my point that back then Naruto(Sasuke rescue arc) didn't know about it...my main point is when Jiraiya talked,it seemed Naruto had fair idea of what he was saying about....it was something he already tried to learn...more importantly something which he could control….
but back then Naruto had no control over Kyubi..he couldn't even remembered how he used to behave after transformation…that's why they sent Yamato to control him....if Jiraiya had to warn him about it then he would have told him not to let his emotion run wild or something along the line...why mention a jutsu...?
now to the first point...going to Kyubi mode doesn't automatically mean performing of jutsu...jutsu is something which is done by molding the chakra..to mold chakra you need control over it...in the earlier chapters Kakashi once explained Naruto why despite having so much chakras he was so weak in ninjutsus...how he wasted chakras...Naruto's initial transformations were exactly like that,he brought forth too much chakra,but he had no control over it....he essentially became a beast...if you remember Naruto's fight with Oro afterward,he actually went up to 4/5tails and what his beast form sent towards Oro was a black orb which was indeed a bijuudama as we found out much later...but Naruto had no memory of it,simply because it was not him who did that...it was Kyubi's doing…
all these seem to point to the fact that Jiraiya was talking about something else....
Things that have been labelled techniques over the years range from those overly complex chakra molding things to the simple substitution techniques to, well, an entire class of techniques listed to physical combat "taijutsu." I think you're seriously taking the jutsu term as a magic term when it encompasses everything and anything that is a "technique" in this world. Even things that probably are just subconscious like Gaara's shield of sand and other things are listed under that term.
And while Naruto may not recall his instances of going berserk, if I was his teacher, and yes, he did mention not going hotheaded, but everyone gets a little emotional, I would sure as hell tell my pupil not to seek an evil force of nature for assistance, which is exactly what he did when fighting Orochimaru. In fact, because he doesn't remember what's going on is a pretty damn good reason why you would tell him not to enter that sort of state and relay what happened during that time. But during the fight with Orochimaru, Naruto knowingly caved in and willingly allowed the fox to take over. The technique grants him major power to help defeat his opponent at the cost of any sanity he has. And it's pretty clear during the scene where Jiraiya is warning Naruto that he's not warning him because he might not be able to control another magical technique. He's warning him "Don't even think about it."
! 
And in the previous page, Naruto even grits his teeth when Jiraiya mentions that it's pretty damn easy for him to lose control.
Anyway, like I said, I'm sure Naruto will either come up with something or developed something he has as an ace in the sleeve because I've been told that this is the giant climactic battle of the series or he'll do some combo with Sasuke or something about the other tailed beasts granting him a powerup… but at this point the power creep has progressed beyond giving the rasengan a nature transformation, sage chakra, tailed beast chakra, and now we've seen not only Obito take hits from four of the most powerful leaf ninja in history but Madara take damage from someone whose power is beyond that of the five kages, and not only would it be criminal for Naruto to have saved a "that jutsu" until this moment but it would be difficult to really believe that anything concocted and simply "not perfected" prior to the start of part II when he couldn't even use nature transformation would really be the key to defeating Madara.
On the other hand like others have pointed out that probably means Kishi will probably pull a "that jutsu" so what am I even saying. I'll just say at this end that you should probably wean yourself off of those ellipses, especially for long text posts.
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