Now, i am a noob, and i have not even tried to look at the source code. but about cheating, it depends a lot on what you mean by cheating. Since reading code is not an easy task especially code of the size that i\'m sure a game like this must have, so it would be very hard for a person to read through the code and figure out flaws or bugs, or other things that would give them a distinct advantage.
The other thing is that most of the changes that you can make to the client only affect you and your client. being open source you can modify your client to do whatever you want, even so far as chaning your character model to something you made drew in a paint program. But that doesn\'t affect the server or the rest of the players in the game. when you look at your character you could make yourself see a movie star, but the rest of us will still only see your original character model.
Then, any other froms of cheating (such as accidently finding a bug that makes you incredably rich and exploiting it to become incredibly rich) really can\'t be stopped easily, that\'s why you have \"moderators\" or whatever you want to call them that try to find those cheaters and get them to stop.
But i doubt that being open source will cause cheating, but every game has people who find a bug or a loophole and exploit it if they ar able too. and i don\'t know may people who can just look at lines of source code and figure out exactly what bugs they can exploit.
