Rimu

Possibly. At the end of the day it’s all just JSON.

Here is more detail - https://codeberg.org/JollyDevelopment/fep/src/branch/jollydev/fep-1d80/fep/1d80/fep-1d80.md

Yes, that’s a setting that admins can choose for the entire instance. Also if downvotes are on then at the community level mods can choose whether to accept downvotes from members, the current instance, trusted instances or everywhere.

The feed creator needs to know about the communities so they can type/paste the community address in, yeah. This feature takes the expert fediverse landscape knowledge contained in the heads of the terminally online and makes it available to more casual/new users.

While the actor is a Group and you can follow it, no posts are Announced. All the federation of posts is still driven by the individual communities within the feed. You’ll need to modify Lemmy to add the logic of subscribing to the constituent communities when you receive an Accept.

Also there are Add and Remove activities sent out whenever the feed owner manages the list of communities within which would need to be handled.

Documentation still to come…

Possibly. (Subscribing to a feed does actually subscribe you to all the communities in the feed. So technically they are not drive-by comments by non-members. But I see what you mean.)

Discoverability is a huge huge problem with all federated platforms and this will significantly alleviate that.

Yes, that is high on the agenda.