You don’t need a stack in F6 to do this you can do it in seconds by applying a swatch to a column setting the vertical height to 100% browser (do this for each section/page).
Then, put an anchor at the top of each column.
Make a sticky menu that links to each anchor.
Yeah,
they both give you an indicator of where you are (vertically at least). I’m not a big fan of these styles, most usability studies show users have a hard enough time with navigating a site that respects web conventions.
@swilliam
Yeah, I figured it’s possible to do something similar without additional stacks. I might try it with swatches since I only need it vertically.