"Mark all as read" button at bottom of feed

A thought I had the other day: put a “mark all as read” button at the bottom of a feed list. Often I scroll down the list of unread items; some headlines interest me so I click on them, and others don’t, so I just scroll past. When I get to the bottom of the list, it would be nice to have a “mark all as read” button there instead of having to scroll back up to do it.

Or, as an alternative, have the column heading box (where the “mark all as read” button currently is) stay on the screen as you scroll, so the feed name, search box, and button are always visible.

Keep up the great work - Newsblur is fantastic!