I don't understand why this is useful. If you use a custom profile, you just make the print, you don't go back and tweak the settings that you haven't saved. Perhaps you're not working in a professional environment?
Robert Liles
Pushdot Studio
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Very professional environment and supporting them, actually. I'm an amateur photog, but definitely a professional when it comes to printing, for whatever that's worth.
It's useful because if you have a series of images that you wish to print and you want the print settings the same, you don't need to keep resetting them or loading saved settings etc.
Custom or canned profiles has nothing to do with it. There are settings such as size, paper type and all the other things that you may want for a particular job and set of prints. It's very nice to not have to check for each print during a PS session that the settings are what you want - they remain at whatever you've set them for that particular run. Also bear in mind that not all users of PS are photographers.
On the Mac I'm quite used to checking for each print and setting anything that's needed. It's not a problem. It goes back to what you said about some OS X users knowing about Windows (some know nothing, but you're far more likely to have an OS X user with Windows experience than around the other way) than Windows knows about OS X.
Believe me, there are many, many pros on Windows who were caught out and not happy when CS3 took away the stickiness even though it simply gave the same environment as OS X.
If you feel inclined, there are pages of discussion about it on John Nack's blog (which is one of the places that Dave chimed in with comments). The link was provided earlier on in this thread by another poster.