I like those rules in Bocc and Kay's posts that were made so far. Here are a few contributions, and additions to some current Tailed Beast stuff that I would like to propose.
The Tailed Beasts are able to be held under Genjutsu, though the only type that they have been shown to be actively kept under good control was with the Mangekyou Sharingan and Rinnegan. Wood Release is also shown to keep them tamed and under wraps. And the Outer Path's Demonic Statue Chains can also bind a Tailed Beast when used together with the Black Receivers. The chains can be created by the Rinnegan wielder themselves, and don't have to come directly from the Gedo Mazo.
Obito's control of Kurama.
http://www.mangastream.to/naruto-chapter-501-page-9.htmlObito's control of Kokuo, along with spawning of the Demonic Statue Chains without the Gedo Mazo.
http://www.mangastream.to/naruto-chapter-569-page-11.htmlhttp://www.mangastream.to/naruto-chapter-567-page-7.htmlhttp://www.mangastream.to/naruto-chapter-567-page-8.htmlMadara's control of Kurama.
http://www.mangastream.to/naruto-chapter-621-page-16.htmlHashirama's control of Kurama.
http://www.mangastream.to/naruto-chapter-627-page-8.htmlhttp://www.mangastream.to/naruto-chapter-627-page-9.htmlSasuke's control of all the Tailed Beasts.
http://www.mangastream.to/naruto-chapter-693-page-10.htmlHashirama is also know for gathering all the beasts can then distributing them among the emerging shinobi villages. It can be inferred that his Wood Release had a large part in subduing and containing all nine beasts. This really kinda put's Hamura's side of the family at a disadvantage, but at least they don't gotta worry about eye-swapping or stealing for their doujutsu evolution. And this also puts anybody else that is not born of special bloodlines at a disadvantage too. But I guess that's the genetic lottery at hand.
I would also like to purpose a Tailed Beast Chakra Mode as an additional ability being available for any host who has completed mastery over their Tailed Beast. It'll serve as another fun perk of being a Jinchurikki.
As for challenge lists for IC hunts, I would prefer that they be Pursuer Lists. These would show who currently has approached a host in showing interest in pursuing them. Whether or not they'll make it first is an unknown, but it can serve as a sort of accountability for both sides. For the host, it would mean that they will be held accountable for making the pursuit fair and do-able for the hunter. And for the pursuer, it would have them be accountable on searching for the host using plausible methods. As the rules said, a battle will happen, but that's only if both parties are willing to comply with that accountability.
That also brings up mixed IC-OOC preferences. An IC hunt implies that if caught, there are risks in survival and consequences on one's own reputation IC. An OOC match means that all that can be circumvented and the battle can just happen without IC consequences, sans losing of the beast. Having an IC hunt but OOC match would completely undermine the purpose of having these things IC in the first place. It becomes a game of keep-away. And having a straight match with IC consequences also doesn't make too much sense.
This is why I believe that it should be clarified that if you're a host, you have to choose between IC or OOC for your challenge preferences. And challengers/seekers should have to comply with that. Don't be that butt who says they're unreachable because they're in a chakra-concealing room or are using a jutsu that does so. Or by being in an entirely different dimension or planet. By choosing to have an IC hunt, you're to be held responsible for yourself to be reachable by plausible means. If you have any objections with that, then I can easily find you through my knowledge of Tailed Beast Chakra familiarity and sensing techniques. I'm sure that Bocchiere and Zenaku ought to be able to find you guys just as easily, or even easier. Otherwise, a strip should be in order.