FYI, if you're having problems with spinning on Synergy, try the program "Multibox". I had spin issues using mouse-span on Synergy but Multibox didn't have that problem. I still have a hardware mouse for each PC but if I'm doing quick looting/etc I don't get throwin into an accidental spin if I mis-click. Multibox doesn't have the fancy layouts that Synergy does -- it assumes all of your monitors are the same resolution.