In mac there are camera for the respective canon/nikon think one can use the edtior to modify it.
I am not very sure how it works...
http://labs.adobe.com/wiki/index.php/DNG_Profiles_FAQ#WhatIsNewAS
Where are the new profiles installed on my computer?
On Mac OS X:
/Library/Application Support/Adobe/CameraRaw/CameraProfiles
On Windows 2000 / XP:
C:\Documents and Settings\All Users\Application Data\Adobe\CameraRaw\CameraProfiles
On Windows Vista:
C:\ProgramData\Adobe\CameraRaw\CameraProfiles
How can I set a given profile to be my default camera profile in Camera Raw?
First, open an image in CR and select your desired profile from the Camera Profile popup menu in the Camera Calibration tab. Then click on the flyout popup menu (to the right of the words "Camera Calibration") and choose Save New Camera Raw Defaults.