While I hadn’t originally intended on supporting player hosted servers because of the whole cheating aspect, I am going to support it now. In fact when I run my game in development mode, I run the World Servers on my PC while the login/management server runs in the cloud. The World Server software will allow you to create a hive like system. Here is what the World Server program currently looks like:
This version is for you to install on your World Servers if you have a web farm. It is also for you to use while developing with this system. I will also make a version that you can distribute with your game where all the options are preset by you and not editable by the player. Then you just kick off this program when your game launches and then their PC is connected to the hive 
Of course you can only use this method of running dedicated servers on player PC’s if you are not concerned about cheating. Because the servers would be running on player PC’s the players would be able to manipulate your world in any way they choose. So just something to keep in mind.