I see, I'm not sure there's anything that does exactly that. You could create a new kind, but keep interoperability in mind — that's much more important than performance. Sharing lists around is useful, if you can get over the fact that they'd be created by your pubkey only.
Discussion
Yeah I've been thinking about the single pubkey dillema. I suppose in DVM scenario the deliverable could be JSON or Markup, which the user could perhaps then publish themselves. Not sure, but thanks for giving me some direction