I don't see why not. There are already some jutsu up that say they can be claimed on their pages, though maybe not enough to justify making a page for them. Though I feel it's more for people to put things on in the future than for anything that exists now, right?

It only appears in the edit summaries, and not on the pages themselves. But think of it this way too: The series has ended, and the techniques section of the Fourth Databook has been translated. So we have nothing else to do but to start making more original stuff.

Or maybe just rip the list to shreds since its purpose was ruined D: