It's in the works, but it's a tough nut to crack. Because scroll effects (especially the design of it) depend a lot on where items exactly are. And with fluid design, text frames might grow taller or get shorter when they get narrow or wider, pushing everything else down or pulling up. That's the nature of the HTML beast. So you're not sure about the exact position of an item. It takes quite a lot of re-thinking on the concept of scroll effects, but I bet the team will come up with a solution.
In the meantime, it's a choice: either use scroll effects and create alternative layouts (the old way, e.g. for your one-pager, or just the homepage in separate desktop and mobile versions) and use a fluid design and some good-old pinning for other pages.