Not sure if this will be useful for you (as it depends how your keys are set up) but I found this addon quite handy when I set up my comp for dual-boxing recently.

http://wow.curse.com/downloads/details/6947/ (NumPadBar)

Basically this gives you a numpad shaped action bar on your screen that you can add skills/macros to and it binds them to your numpad for you (I think you have to make sure numlock is off though). I think it is somewhat resricted for classes that have seperate stance bars (e.g. for moonkin form), but might be useful as you could bind different totems to that and then choose when to use each.

There were also a couple of addons I saw which did this, this just happened to be the one I downloaded.

I'm also thinking of dual-boxing a 2v2 arena team. I was planning to 'solo' on my hunter and lose my 10 games a week for the axe, but then I figured I might aswell add in my druid for double the welfare epics. She's resto at the moment, but I'm not sure if I'd have more luck going balance to try and at least get one opponent down.