Doesn't oQueue send a lot of whispers that is hidden? So it would kind of let you stay online. I noticed those whispers when I have logged into Hearthstone and forgot to change the broadcast from (OQ) to something else. Since anyone on WoW with the addon will have the addon think you are on WoW and spam you with a list of signs and just send over and over to synch your oQueue with theirs. Since you don't have the oQueue addon in Hearthstone it won't hide them or respond so you keep getting whispers over and over and your screen will fill with those messages :P That is the reason I uninstalled oQueue.