IDcs2 late binding RGB to CMYK

InDesign CS2 uses two document profiles, RGB & CMYK. I have been using a "late binding" workflow with an Epson R1800 "RGB" printer, letting InDesign convert to the Printer Profile.
I was surprised I cannot use the RGB document space and let ID Determine Colors for the CMYK Printer Profile for a Phaser CMYK solid ink printer.
For CMYK printers are my placed sRGB images converted to the CMYK working space of the InDesign file for output, or are they just passed through so I can still allow ID to Determine Colors for Printer Profile selected ?
Does the same hold true for separations made to film or plates?
Thanks, Mark
Mac OS 10.4

Mark,
First, I work on a PC, so there may be some differences. I have sporadically had problems getting accurate color from IDCS2 when outputting to an RGB printer. I'm not sure why it happens, and nobody (including Adobe) has managed to explain what happens with RGB files sent to RGB devices. So, for that reason alone, I do not recommend using late binding workflows. I think it is an Adobe print engine issue, but they'd deny it no doubt, as they usually do. When the couldn't solve the problem, they just became "unavailable". In theory, when printing from IDCS2, the ID print engine will convert ALL document colors to your intended print space.
If my final intent is a press or other CMYK based device, I always place CMYK images into ID. I soft proof my final output space while editing in Photoshop, which I trust a lot more than I do ID. By the way, I have not had any problem with CMYK files rendering incorrectly, so that seems to work fine.
I don't have ID open right now, so I cannot answer some of your specific questions. For proofing on an RGB inkjet device, here is what I do.
1. Create the entire document in the destination CMYK space, including all placed images. Make sure the ID document itself is set to the same CMYK workspace, and make sure the document blend space is set to CMYK.
2. For proofing on an RGB inkjet, I first export to PDF, leaving color unchanged. Then I open the PDF in Acrobat and set up my print stream to have the correct printer profiles, etc.
3. I usually send both the IDCS2 file and the PDF to my commercial printer. This way they have both, just in case there is an issue with the IDCS2 file. And I ALWAYS have them generate a color proof on their inkjet as a contract proof. I like to compare it to my inkjet proof to make sure everything is right.
I hope this helps somewhat, though it doesn't take you in the exact direction you intended. I think Adobe still has work to do on their program, but perhaps this has been fixed in later releases of ID.
Lou

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    For some reason you want to convert your RGB source clip to extract individual CMYK (Cyan, Mangenta, Yellow, blacK) channels. For example you'd want to simulate the printing process of a book on a printing press.
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    Magenta = ( ( 1 - Green ) - Black ) / ( 1 - Black )
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    Remap White To:
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    Hope this helps.
    Lou

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