It would be great if one could Upvote and/or Favorite whole pools and/or sets at-a-time.

There's a limit per time to upvoting posts. A feature to upvote an entire pool or set would probably just be a thumbs up on the pool/set itself, not each post.

On the posts list, you can use the dropdown list under "mode" to enter "Add to favorites," if you look at the list of posts in a pool or set you can favorite them that way, and you can probably use some custom code to add "upvote" to the list too.