My multiplayer suggestions. Create a new multiplayer Sharegame (or other) world using all the options of the Editor "generate" feature, then use a DENSITY slider to adjust amount of flora/fauna/resources. Use a DIFFICULTY slider to adjust hit points, damage, etc., but also proximity of main resources (flint) to spawn point and a respawn timer on hostile animals. You cannot plant anything, more temperature sensitive, whatever. Just the two sliders, but lots of effects when it is cranked up. Just Create and you have a unique multiplayer game in minutes.
Right now is like an enjoyable demo of a game. That's mostly because it is way too easy. Within 30 minutes you have iron armor and lance, you can melee anything in the game. No challenge at all, just a building game really. Not PvE, there is no E. Not PvP, either, unless you count ganking. This changes dramatically once you remove flint from the spawn island. Or clay, or trees. Crippling the tech tree is currently the only way to get anything resembling a game and it works to an extent, but the tech tree is not currently designed around this. It could be, with a few changes. It isn't quite lineal enough, some resources open far too many options up (clay, flint).
Properly done, one must make and use every armor type and every level of weapon and work your way up to the next one. Bows are OP and should come much later. Melee a bear with a mace and leather armor first. Crippling the tech tree allows this to happen naturally. You can do much of this already using the editor, but it is very time consuming and Multiplayer is by nature disposable, due to griefing, lack of respawn, etc. I have spent many hours messing around with all of these ideas in game, that's my opinion.
If you don't agree, try my scenario Frostbite Hardcore Survival. It is simplistic and very unrefined, but by limiting resources it forces you to really use various armors and weapons, repair them and salvage them. Also, it adds a time factor due to the cold and a very real risk of losing all of your gear and never surviving long enough to recover it. These add much needed drama to the game. Risk and difficulty are vital, but having a slider keeps everyone happy and interested. Right now it is really boring because it is way too easy.