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The only thing I found so far is that you can go to System Preferences > Mission Control, and uncheck the box for "Displays Have seperate Spaces" That way you should be able to have A chrome window extend over to your second screen as well. I can't test it here, since I don't have a second screen.
Try it out and tell me if that works.
I'll post over in your thread so we don't go too far ot in this thread.
Okay, I somehow killed my post in your thread and am now unable to post it again. It doesn't appear for me but everytime I try to post it my post count goes up by one. Very strange.
So here's a short version of my post:
It enables you to stretch windows over multiple screens but unfortunately the result is very annoying to work with and only slightly usable if both screens have the same resolution. Even then you have a giant window stretching over multiple displays leading to enormous annoyances (like having to do minutes of undocking and reordering everything every time you start the app).