I may be answering myself, but I'm not sure. I just happened to see the same question in the mod section ...
http://www.subsim.com/radioroom/showthread.php?t=96451 ... The implied answer is that this is linked to the selection during TGW install of the generic contacts option, ie if you choose not to have generic contacts in the ship id book, this also gives auto id in UZO. Is that right?
I guess I should have posted this in the mod section, but I didn't think it was necessarily a TGW "issue".