Here's my additional feature request:

Allow me to scroll until all posts are read.

I assume that this would be accomplished by letting me scroll past the last post.

If you felt uncomfortable about the empty screen (I don't), you could add some simple background effect or even a dummy "you've reached the end of the internet" post or two.

Context: I don't want to be scrolling Lemmy all day. I want to be able to view the top posts of the day, scroll through them, get to the end, and know it's time to stop. If I open Boost again later, I don't want to see anything that I've seen before.