You can also make a private feed of just the communities you mod and see them all together that way. Not sure if that would do what you want, but it's a ln option for now
Yeah, I think this is doable. I recently did something very similar when I added the oldest first sorting. The only tricky bit would be getting the list of just moderated communities, but there is a function for that iirc.
Honestly, finding a spot for it the UI and making sure it's responsive might be trickier.
Yeah it's like 'moderated_communities' or something. On most pages already. Just getting the extra view option to show up in the UI, and only when the current_user is a moderator of anything that will take some tweaking. Doable, though yes.