This change was implemented because too many players complained coming back from AFK and having forgotten to change their status back to not-afk (it's more common than you think, a lot of players play with their name hidden). To play the game with an unnoticed AFK status can be an inconvenience (I've heard so at least. I've never been on AFK status so far so I don't really know. I assume it blocks something?), while to be AFK while your status is non-afk doesn't really seem to cause any problem. Is there any particular reason to want to be displayed as Away From Keyboard without the minimum 5-minutes timer?