Hey! I found a way to make staircases within vents without kicking players out of the crawling feature and making them stand. You can do this by placing items smaller than slabs in-between sections with slabs. However, I think it would be a good idea if there were official blocks to do this rather than having to rely on blocks that aren't supposed to be used for this (ceiling lights, microphones, pizzas, etc.)
As always, just a suggestion. Thanks!