"Multiboxing is fine, we allow/tolerate it, but dont support it': is pretty much the standard reply you get on the forums. It's the reason why branded computers are sealed, if you break the seal to change parts yourself, warranty is gone. It's the reason why warranty is gone when you start pimping your car as well.

Multiboxing is beyond the intended use, and uses 3rd party software. What did you expect? That being said, I've had helpful blue's when I had a question about playing wow on linux, which is pretty much in the same boat were multiboxing is. In the end the guy ask you if you have the same issue while single boxing, ...