At the moment I need very few more missions (assuming they are/will be fixed). One of these is Stonemason IV, which requires 2500 cobblestone mined. Our generator produces 0 cobblestone so you basically have to (if on a coop) leave and make a new island to get it. Pretty much my suggestion is to make different generator levels toggleable. That way anyone could set it to the basic generator and be able to get all the cobblestone.