@ lesli
i can see where your going.
when coming up with it originally, i wasn't quite sure what i wanted to do with it (believe me, ive re-written it about 12 times XD) however after deciding on the clans name that i had part of a direction. [url=http://narutorotg.proboards.com/thread/9/clan-organization-review-thread]Here[/url] is the Eta clan description, and can hopefully shed some light.
as far as needing it, i guess thats really a matter of opinion really. As much as id like to say i do need it, thats really up to you guys XD 
[keep in mind its still under judgment and not official]

as far as usage, even though its a combat oriented skill, its still mainly defensive in nature. 
doubling back on the KG, i guess you can say in a way its almost akin to a taboo in using it. Because of the way the original clan was almost wiped out, its more of a last resort plan. however this adds to character development in the sense that people in Kirigakure generally look down on the Eta clan, adding to Arashis problems getting to know people. If they know he possesses said KG, even more pressure would possibly arise from the general fear of KG (if it still exisits)
at this point ive kind of delved into some facts that pull in the clan itself into the argument so ill stop before i start rambling [s]more[/s]

also, as far as new releases, thats fine, was just an idea at the time ^^