Since the average PvP spends quite a significant proportion of his GW2 life waiting for the queue to pop in HotM anyway, I suggest adding the mini JPs from the Ranked Maps (all the ledges, small nooks etc on Niflhel, Foefire etc). They can be decisive factors in high ranked play, but I doubt most people have the nerves to practise them in empty maps. So they might as well be added to the lobby for practise. Even the NPCs (Svanir, Lord etc.) are there, so why not the JPs?