According to Jay there they can do that for you it's not real difficult though, if you're familiar with SSH and WHM they give excellent step by step instructions. At the time that I purchased it the cost was very reasonable but I have noticed that now it's much higher so unfortunately I am going to have to stop recommending it in the future. Not that it's not a great product, it has certainly done a great job for me just that they're asking a pretty good chunk of change for it now.
Jay, I have not seen much in the way of CPU usage myself but I also do not receive a LOT of spam either. I would be surprised to learn that it uses more than Spamassassin does though.