I've used dual monitors for years: How I finally fixed the 'invisible wall' ...
David Nield is a technology journalist from Manchester in the U.K. who has been writing about gadgets and apps for more than 20 years. He has a bachelor's degree in English Literature from Durham ...
May be you can do this with Virtue. You would put a virtual desktop on each screen, and Virtue allows you to move windows between desktops using any key combination you want.