The shift from core being the default gamemode to Hardcore is a mistake. It makes the game unfun and tedious to play. Either make a Core server so that people who don't want to waste time worrying about eating/drinking/sleeping can play the game how they want or release the source code like you promised and let people host their own private servers with their own rules and settings. If making a new server is either financially or technologically impossible, you should direct your efforts towards creating something to allow players who only want PVE to play PVE; perhaps something to tick on the forums that would link to the game or a way to start the game in PvE Mode from the launcher. Players in this mode would be unable to harm other players or be harmed by other players, and would be set to Core mode. You would be unable to change from PVP to PVE in-game, preventing people losing a firefight in PVP switching instantly to PVE, and maybe some sort of scripting to make it so if you were damaged by another player in the last minute of play before you left or something you are unable to log into PVE (If they alt+f4 for example). Again, if it's beyond your ability it might be time to release the source code or hunt down someone willing to do this for you.