Not so hard to code, yes, probably it would look cool, but I ask myself if it's worth the polycount. Imagine, this is not only for a demo that shows off some dusty particles in the air, but for a game engine that has to do a lot of other things as well. Personally I know that if you add a lot of power-consuming effects to an engine, the game will be slow as death.
Sunbeams-in-dusty-air effect
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