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The application i'm working on can be displayed either on multiple monitors or as tabs on 1 monitor. All the top-level controls will be located on 1 (main) screen and additional screens will display whatever is in tabs. In attached mock-up you can see that i have 3 positions left where this button can be placed. I feel it should be on the left side of the second level of menu, but i would love to hear what you think.
I feel multi-screen is a user option, so it should be next to user controls. Besides, putting it on the 2nd level controls wouldn't it be relegating it to "secondary" importance?
Firefox puts their "tab groups manager" icon right along the tabs:
