It's nice to see that A Choice of Catastrophes has continued in this direction.
How so? I haven't read it yet and didn't know it had anything to do with that.
It's not directly tied into those series no, however, Michael Schuster and Steve Mollmann have really given a focus to several lower decks characters such as Salvatore Giotto, as well as managing to include almost every background character seen in TOS
including DeSalle, Leslie, Brent, Nurse Thomas. You name them, they're probably in this.
I'd definitely check it out, it's a great read. Judging from the review thread, it's not to everyone's tastes, but I'm enjoying it.