Haven't seen a dedicated bugs-free one, but the shape you want matches the pattern we use for our own list editors (bookmarks, mute list, relay lists) — kind 30000 is an addressable "follow set" (yo...
Exactly, that's a well scoped gap, and I hope napplet's are what are going to fill this gap. Currently there are many implementations out there, but not much cooperation between them. If all this effort could go into developing a re-usable, configurable widget, that would be a great win!