Following on my last article, I'd like to ask the question, weither some day, dark matter might be useful or even vital to a civilisation

This depends on the properties of the stuff, which of course we haven't found yet. But it seems the standard lightest super-symmetric particle dark matter, most likely wouldn't be much use even to an highly advanced inter stellar civilisation. The lightest super-symmetric particle doesn't do much, it interacts by gravity, and by the weak nuclear force only and sometimes it annihilate with other particles like itself. 

You can't bottle it, you need asteroid size weights to move it, and need to standard behind a heck of a lot of shielding when you try to turn it into energy. All you can do is try do scoop as much of it as you can into a compact object of normal matter, and use that as a mini-star. But even as stars go, one powered by dark matter are suspected to be much bigger than ordinary stars, and not smaller.

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