Yeah i understand where your coming from. But i've been very exprience with retail server (5 years +) and loads of other servers with high protection with very high active GM's. The funny things is that the server is filled with dual boxers. The GM's will only take action if you are so blantly ''cheating'' and also have a very high advantage over other players.
And most of all if your very well known on the server too. If you keep a low profile, be nice to players and don't dual box in very high populated areas or very clever dual boxing such as logging in your buffer, buff and then logged the buffer out.
Theres little things out there that will stop you from getting banned. I got a friend whos dual boxed for ages on this server and never had a GM problem since. You just need to use your head :)