Not sure about that.

Putting PubSub on any jid, including MUC jids, is fairly straightforward, and it's a single line in a spec that wants to use it. As I said, "not exactly unspecified either". Still a standards/spec issue, just a very very small one, and not one that needs its own XEP.

If you wanted PEP on MUC, that's a bit more involved, since we need to decide how the autosubscription might work, for example, and whether the smart defaults that PEP requires would be the same, different, or not there at all. I wouldn't swallow this into another dependent specification, but specify it in its own XEP.

Dave.