Ya, tried that ... probably good with two identical monitors, but I'm using two different ones
I ended up booting up my old computer (it has an nvidia card in it too, of course) and hooked the second display up to it, and am using synergy to connect the two ...
someday, maybe I'll be able to use the 'full card', but after talking to the FreeBSD kernel developers, I think it falls under 'not any time soon' ... seems that the list of things to do are required for more then just the nvidia stuff, just nobody has much time to implement them *sigh*