No adhoc support for local link messaging contact
There is no item "run command" for link local contact, wheras we can find one for a regular contact.
I am not sure it will be useful by itself, but it will be consistent with regular contacts.
This is not included in xep-174, and i'm not sure we should do this. Since link-local messaging is a bit apart from normal jabber messages, gajim would be the only client supporting this (which would not be a bad thing). Maybe we should check what current implementations do on getting a pubsub request. There is no way to tell if a client supports pubsub or not since there is not capabilities stanza. So if there is an answer to a request, all fine. If not, it could also mean there is a problem with the network or simliar(and AFAIR, some clients simply drop the connection on invalid stanzas).