It's something we've talked about. The problem from our point of view is that whatever measures we put in place, like time limits or account locking, anyone truly addicted will work around and end up with 3 steam accounts to play more.
I feel like a lot of the destructive stuff comes from the 24 hour nature of the game. Being offline raided. We've considered having servers that are only open for 4 hours a day, at the same time every day. I'm not totally sure this would solve the problem - because it would obviously require self control to not be in multiple limited window servers.
Got any ideas?