there is an ambient option in the script.
i have lots of ideas how it could be improved but i didn't want to work on that before there is a good unwrapper. you could easily improve the script yourself though.

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so does that mean its finished now?
no, it's not finished but it can be used already if you care for the second uv-map yourself.
i am not sure if would be a good idea to release the current unwrapper. you would waste a lot of time with trying to get rid of artifacts with complex models.