I think I would want one list of stories. I like how Instagram will just play through all the stories straight. I think stories is pretty different than feeds so you don’t need that categorization.
The other thing is I’m wondering, do we just make the story JSON mf2 json since you all have experimented with that as a Wordpress side file?
channel: ['stories']
or you could make a specialized Micropub app like that have a config screen where you define what additional metadata it sends and then people could use whatever method they wanted, a channel property, a tag property, etc. I definitely don't think a new attribute would be right, and I know channel isn't really used anywhere except your and my sites, but we also can't do tag as a default or else the posts would automatically show up on people's websites as a normal post (unless they configured posts with a specific tag to be routed somewhere else). So this is tricky, but I definitely think something like this would be required for me to use it routinely. My default for my site would probably be to use a 'stories' channel and then to be able to set an audience on each photo/video so that some things I could provide to a subset of people.