Star Wars has, as near as I can tell, more both in terms of tie-ins AND tie-in stuff that snuck into canon.The count on the latter would run into the dozens, easily, if not much more. Trek has been notoriously stingy in that regard, prior to the modern era. In fact, the PTB made it a point NOT to raid the tie-in stuff (though one or two things did sneak through, like the use of one of the old FASA starship designs on a computer readout in TNG Season 1).
The story of how "Hikaru" was canonized is a case of "things did sneak through." Peter David was visiting the set of Star Trek VI when they were filming George Takei's scenes on the Excelsior. Peter and George were old friends at that point, Peter mentioned to George, "You know, Sulu has a first name in the fiction," and George used it on his own. Honestly, even if one of the series adapted one of the novels fairly directly I wouldn't expect the novelist to receive an acknowledgement, let alone any sort of story credit. (WGA has rules on story credits.) Nor would they get an invite to the premier. Maybe a producer might mention them in an interview. In some ways, I'm surprised televised Star Trek doesn't mine from the tie-ins (novels and comics) more that it does; the studio owns the material, and it's a massive IP farm they can dig into at will. But producers and writers rooms might also have a "Not invented here" attitude, so unless someone in the writers room was a fan of a particular tie-in work and wanted to play with it -- say, taking Probe and using it with Disco -- the idea of mining the tie-ins wouldn't even cross the mind.
Yes, she wrote the first draft of the script with Michael Reeves. That's why she received the credit. WGA rules.
Because he passed away (for those who didn't know). I did get to chat with Mike (aka John M Ford) about the songs at a convention in Australia. My two friends were huge musical theatre fans and Mike was astounded by how much they had picked up. (Our plan to delve deeper into the book never happened and they are no longer a duo.) http://therinofandor.blogspot.com/p/how-much-for-just-planet-search-for.html Please let me know of any updates!
TFR is probably my favorite Trek novel, but I can't believe I didn't get this before now: Spoiler Zharn, the mind-wiped Klingon assassin, is responsible for the deaths of Admiral van Diemen and Maxwell Grandisson III. I mean, it's obvious when you think about it. So how the fresh hell did I miss that?