Unfortunately, that's not what most of us are looking for. That isn't true dual monitor support; that makes Windows think all your Mac displays are one big monitor. The problem with this is twofold: first, windows that are centered pop up straddling the two displays. Second, when you span both your Mac monitors, your virtual Windows desktop is limited to the height of the smallest monitor. So, for some people who use a MacBook for example with an external monitor, if they enable this "Use multiple displays" they only get a vertical 800 pixels of Windows space on the external monitor no matter how big it really is. Passing through the parameters of the actual displays to Parallels and creating two virtual ones there would be best, but I bet the trouble comes in integrating those two displays into a single Parallels window. Still, I hope it will be done. Parallels+Windows on OS X in Coherence mode is the Killer App for me; this would make it even better.