(OK, it's not really that new - it's just for one reason and another we never got around to registering it properly before)
I particularly like using this on courses which have quite a long menu as it really annoys me (and presumably annoys actual learners even more) when I have to keep scrolling back down every time I return to the course menu.
I haven't tested it extensively on pages that are both long and heavily trickled... so not 100% sure how well it would handle that.