The rating prompt only happens for purchased books. I haven't read a book from Kobo for a few weeks. But, I just refinished one now and was prompted to rate it. That's with a, shall we say, newer firmware version.
Have you turned it off with a patch? I don't think there is a config option anywhere. And I think you asked a question about parental controls. The rating could be something not shown when parental controls are on.
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