You know when you can invade a battle? You do, you get a nice notification. Well, the same call for action should be shown when you are in the multiplayer lobby and someone has joined the duel queue and waited there say more than 10 seconds. And that prompt should stay up until they have been matched or they cancel. And same again for league matches and perhaps even an option for custom games. I'm tired of waiting in queues
And given there aren't that many players around all the time, this would serve as a great way to engage each other. What do you think?