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Of course this only works with a Mac-version GPU card or a reflashed PC/Windows GPU card, but I assume you can try it out with something like my old HD-5870 Mac GPU card, take note of the position of the various startup drives, then when you change to the (non-flashed) PC/Windows "Metal" compatible GPU card and have a black screen in front of you after having pressed ALT for a while, you just press the left/right arrow keys the amount of times as you've noted down, then press RETURN to choose it -and after a while it should boot into Windows and the screen should display the Windows desktop where you can reflash the GPU card (so the next time you restart and hold down ALT you will actually see the startup drives on the screen).
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I can now boot into Windows by going to System Preferences-Startup Disk and choose the Windows disk, or (IMHO a better solution if you normally use MacOS, as this will default to boot into MacOS the next time) hold down ALT while the computer starts up, then choose "Windows". after several attempts I've managed to install Windows 7 on a separate hard drive placed inside my cMP Aha! So you guys are talking about using a complete hard drive/SSD for Windows ONLY, and also WITHOUT using Bootcamp! That sounds like a good idea, because Bootcamp IMHO isn't as easy to set up as Apple makes it out to be.
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