This sounds very useful!

I think it's very good idea to have strong linking of who runs what pub, but is it overkill to then have that feed make statements about what is running on that pub?...

I'm imagining that they ssh in, update the pub's code, then start it again, the pub looks at the last message it posted describing it's feature support, and if the features have changed since then, publishes a new one automatically. Seems far easier for the pub to do this, rather than the pub's owner, who would need to correctly state what features are supported.