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It is a good idea. I have wanted something like this for ages. If someone is clever enough they could build it in to preferences which modules they wanted FAQ for.
My opinion is that it should be a requirement for those who submit modules, they should include FAQs or Help, for the public users, (not me, I know how to use XOOPS after such a long time).
Some of the really good ones like Video Tube include extensive help sections for public users (and I promote their help sections on my site...get clever and get some extra promotion).
Coppermine Gallery, (an open source software program I use) provide an excellent FAQs section for general users. Surely XOOPS could do the same.
Just a humble opinion from someone who has never ever submitted a module.
Barry