Mark "All posts as read" from the main menu of a group

I have a wish (a pony?) for the new LT2.

In order to get a quick overview of new messages in a thread, I am forced to open a topic to zero the counter.
I would like to see a similar way to "Stop starring this topic", "Unstar this topic", "Ignore topic" to set "All posts as read" from the main menu of the group.

Bump.

A "mark all as read" button would fit gracefully above the shaded title bar's "unread/messages."

Bump.
I would like that very much too.

See also: https://www.librarything.de/topic/324454#7266514 and more.