I would ask him to add... PVP! However there should be something in options/settings to turn off PVP so when you are AFK some random troll wont come and attack you. Also I would also ask him to make it a little like Impressive Title/World, you could have a health bar, but you wont die, if you run out of HP, it will just say, "You are wounded!" in the chat. Also, I would ask him to add prey and hunting, and you could be able to tame the prey and you could have a pet. If you killed the prey, you would be able to eat it and regain health. There should also be more actions. Also he should make an offline mode, so you could play as your character. And there should be a campaign mode, where you can make your own campaigns, play them, and even put them up for download so others can play them! These all might not sound like good ideas in your opinion, as it may increase lag, but meh.