When typing a comment in the share bookmarklet, the keyboard shortcut for "post with comment," cmd-enter, does not work. It triggers the animation, though -- the share with comment button turns gray and says "sharing" for a moment, then returns to its default state.
Yeah, it's supposed to have the confirmation. Just released a fix, although I'm not 100% positive it's the right fix, since the confirmation was supposed to be there the whole time. I notice that it's missing occasionally, but we'll see. it might just be under a specific condition that I'm not reproducing right now.