Damn! No Maya 2011 version.
Pior are you telling me that there is a way in Maya to freeze or set the ratio before starting the UV unwrapping process?
For example say I have 10 object in my scene. If I combine them all temporarily and apply Automatic UV mapping then the UV texture image squares appear all same size on all 10 objects. If I apply automatic mapping individually on the 10 objects then the UV image square appear different size on different objects.
Are you telling me there is an option in Maya to set a fixed ratio so that the UV image squares appear fixed size on different objects every time I unwrap?