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For my keyboard layout, I've grown used to having they key right next to my space be Alt-Car (right). Now that I'm on a Mac keyboard, it's Command. Is there any way to map only the right command key to alt-car (right)?

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Have you tried keyremap4macbook ?

By checking the option:

Change Command_R Key (Right Command) > Command_R to Escape

I am using the right command as meta/alt key throughout mac os.

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Just installed the software, now called Karabiner, to use on Emacs. Unfortunately it's a little large at 9 megs just to remap one key, but works very smoothly, and was able to set the remap (Command-R to option) to only happen in Emacs and a few other apps. Níííce! – Mallory-Erik Jan 5 '15 at 14:46

You can try DoubleCommand to remap the modifiers.

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That does not take into consideration left or right position of the command key. – Lazlo Jul 21 '11 at 20:40

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