I have started collecting your Star Trek novels, after having gotten to know your writing through Young Wizards. Just finished Spock's World, am a few chapters into The Wounded Sky.
I'd just like to say that I love the way you embrace diversity as a concept in your writing. Your Starfleet is full of Terrans, sure, and humanoids, but also overflowing with nonhumanoids, with species whose inclusion necessitates accommodation and work and cooperation, and it's just so very STAR TREK, in a way even the most ambitious episodes of the original series and TNG never managed, for budget reasons and probably because someone, somewhere said "nobody would deal with that on a starship."
It makes the things that aren't present in the books, the diversity that no 1980s publisher would have allowed in such a mainstream property, feel less keenly absent. This alien is a genderless crystal whose experience of time is utterly beyond my understanding, I think, so of course there's room in this Starfleet for an autistic agender bisexual like me.
It's really uplifting in ways I wouldn't have expected before I really got into your Trek novels.
I'm glad the books have worked for you.
I think one of the things that may be working in my favor here is a tendency to take a series's (or IP's) professed themes and/or philosophies at face value, and run with them—treating them as if they're worth wholeheartedly accepting.* The fairly early statement of the IDIC concept would have been one that jumped out at me when (like all the other viewers in the mid-to-late 60s) I was watching Trek for the first time.
But something else that would always have been in the background for me was a very early engagement with, and enthusiasm about, the relatively hard-SF concept of More Alien-Than-Usual Aliens. This would've come from reading authors who espoused it: Heinlein sometimes, Ted Sturgeon sometimes, but also E. E. "Doc" Smith and William Tenn and Cordwainer Smith... and also, very especially, Hal Clement, who's too little-known these days and did some of the best aliens ever. Add all of these (especially Doc Smith's Lensman series) to a longtime fondness for the Green Lantern Corps, and you wind up with the general let's-get-out-there-and-have-a-good-time-with-our-extremely-alien-cousins approach of the Young Wizards series.
So when they and the Middle Kingdoms crowd (with alien species holding positions of prominence in both series) got me in the door at the print end of Star Trek, the tendencies I'd already been exploiting on my own turf more or less inevitably came with me. As far as I was concerned, the more aliens (or non-usual Earth-based species), the more fun I was going to have. And when it came to the IDIC thing, I didn't think Gene had mumbled. The more diversity, the better.
(No one complained about the unusual aliens, either. The nice thing about Trek-novel writing is the low special effects cost... since your readers do it all in their heads. Original Trek was always running into the "We can't afford that" thing, alas. Not a problem for me, though.)
Anyway: Trek is absolutely, from the ground up, a place where all possible diversity belongs. You could make a case that the Trek series that have least featured this aspect of that universe have in turn been the least effective ones. ...But I'll leave it to other people to argue that out. Myself, I managed to work a sentient-mathematical-concept-Green Lantern into a GL script one time. It'd be fun to do that (and figure out how to make it visual!) in Trek. ...Later for that.
Meanwhile: it's my pleasure to have been of service. Thanks for letting me know. :)
*See also the old idiom about "taking the King's shilling". If you're going to accept it, don't waste everybody's time on half-measures. Go transgalactic or go home. :)