Requested feature overview description.
just like the "add to set" or "add to pool" button at the options section a "remove from set" and "remove from pool" button.

Why would it be useful?
Currently we have to search with the ID of the post and then remove it. With this we could go to (in most times we would already be at) the work in question and remove it.

What part(s) of the site page(s) are affected?
we would have two more buttons at the options section.

What's with this. It's always such a hassle to move posts from sets to other sets. That might be a problem rooted in my decision making but it would be a quality of life improvement nevertheless.