The ability to press UP (arrow) when selecting the list of Labels to jump to the bottom of the filtered label list (like you can do in Gmail) instead of having to press DOWN many many many (many) times (or use mouse) to scroll to the bottom to select a Label near the bottom. i.e. WIth the Gmail shortcut keys while viewing a message, press 'L' to label it, then start typing some subtext of a label, which filters the list of Labels to apply. In Gmail you can just press UP and it will jump to the last item in that list; in Missive, you can only scroll down to get to the bottom. This is a pain when the filter shows a LOT of Labels that the current filter provides.