@Gargron the ability to clear any column (including lists, hashtag columns etc.) AND refresh each one (an "undo" for the clear)
it can be useful for people who like to keep an eye on news ... as a "bookmark" of what has already been read, and what hasn't yet
i know it's already possible in the notification column (but you can't undo it there either), but it would be nice to have something like that for all of them :)