Not sure what you mean with ball kaiten. If its just to spin them around fast, that's not exactly custom cause that falls under the sphere manipulation the shroud itself grants already. If its to try make a kaiten with the chakra making those orbs, if they're nerfed then it'd be just a powered up kaiten with nothing extra really. If anything it'd exhaust your shroud far quicker cause kaiten uses a crapton of chakra as is.
I believe juho soshikens potency comes from it being compressed in the first place, so I don't think it'd work anymore as an aoe thing, if it would even be possible to sync any other chakra with the shroud like that to begin with. Furthermore, fairly sure I listed in nerfs that if you use the shroud, you aren't getting any other body oriented boostage crap.
Though juho soshiken sucks chakra from victims (according to wiki anyway, I don't recall ever seeing said effect in series), I don't really see how exactly would that turn it into a specific anti-all jutsu device, at most it'd deflect projectiles and such if struck with it. It might be possible to make a stronger version still though, as seen with Hinata's version being powered up by Hamura's chakra, though it'd be even more exceedingly difficult to learn.
I've never ever understood this whole jyuken element thing people got going on from the looks of it. All jyuken is, is releasing small pinpoint bursts of chakra to reach inside the body as you strike, aimed at organs and other vitals to maximize damage. There is no way to 'grant' something jyuken, so that alone makes the invincible death laz0r already impossible.
Should be everything. Though as Ichi already said, we could just ban custom moves for it. Lazy but easy route.
1) Kaiten, in SL terms (even in-game) does not require nearly as much chakra as you're implying here. Additionally, I was talking about using the orbs within the kaiten in order to add increased deflection, along with having the option to still fling them out at people nigh at will.
2) Body oriented boosting stuff essentially, under your statement, is everything except Tensaigan. No Byakugan powers, no sage mode, no gates, no Yang release period, etc. That is essentially saying that with this dojutsu, you can only use the powers of the dojutsu, and nothing more. Considering the proposed nerfs, I don't really think that's going to bring it into balance with Rinnegan, which CAN have other body enhancements of the aforementioned state and still keep chucking down meteors.
3) It's not as difficult as you think. Kaiten itself, in SL, hass often been used to attack ninjutsu and either dispel it or redirect it. I have fought a Mist Hyuugan before, so I'm aware that there is currently a meta regarding gentle fist that allows for the application of the right amount and type of chakra in order to counter any chakra-based jutsu out there. While it is somewhat custom, and likely not explained very much to outsiders other than combatants, it is in my mind because it does exist.
Additionally, by making a taijutsu version of Preta Path, you can punch your way through most chakra-based barriers, ninjutsu, etc. because you would be able to absorb/kaiten your way through the techniques.
4)
http://naruto.wikia.com/wiki/Gentle_Fist The primary trait of gentle fist is to "surgically" inject their chakra into a targetted area. This stems from the Byakugan's unique eyesight. By including this "surgical insertion" principle into techniques, this allows the user to strike at smaller levels than thier counterparts.
For example, by adding jyuken to the susano'o sword (just because it's a relatively easy example to represent what I'm talking about) you would essentially strike not just with the force of the sword, but using the chakra to attack pinpoint parts of a defense (such as a chakra based one). By using chakra to strike at weakspots easily seeable with the byakugan, the sword not only has great physical strength, but also incredibly precise damage, capable of attacking a tailed beast mode jinchurikii's tissues (connective, nerve, muscle, etc.), organs, and gates/tenketsu in a manner that makes the attack a double edged sword.
If the jinch were to attempt to use a chakra-based defense against it, a strong enough injection of chakra in a specific area will allow the user to cut through it with magnificent ease. Recall, the gentle fist does not necessarily break the skin of a human target, so complete penetration of the outer barrier is not necessary for even marginal success. It's the principle of injecting your chakra in a very specific manner that can be applied to other techniques. Dare I say it, frog kata could use natural energy to strike at tenketsu presuming the user knows gentle fist, frog kata, and has the byakugan (and presuming he is not voided into oblivion cause chakra =/= natural energy, though I think you guys get the idea by now).
And am I the only one who is actually more concerned about Tensaigan/Rinnegan hax? One eye gives you chakra mode, the other gives you the Six Paths. Of course, I'm sure Warren's blanket "no other enhancements" nerf proposition likely covers that.
Amusingly we can't get much closer to canon than that. Give your own eyes away to power up the altar, get eyes that have already been mutated by the altars power back.
Why not just save people the trouble and just give them the dojutsu for free and state that there is a cooldown time before actual usage? Unless I misunderstood and you either require other player hyugans to put their eyes into the altar (and not have those eyes be re-usable), or use it to SL-wise explain what happened to all of the hyugans/byakugan that used to populate the server, that is hardly what could be called a limiting factor. Even Rinnegan is
supposed to require the acquisition of a mangekyou sharingan from another player (after of course getting your own) to advance to EMS, then advance that to Rinnegan (whether people follow it or not I guess depends on where you RP).