To what extent does your status as, for want of a better term, an indirect employee of the producers, inform your opinion? For example, do you think that Trek producers would potentially retaliate if you were to say that an unofficial product had canon status, preventing you from further work?
Why would I do such a thing? Star Trek is a piece of intellectual property. CBS owns it and has the right and ability to profit from it. If I tried to assert that my tie-in work were "canon," I wouldn't be able to benefit in any way from such a claim, because obviously I don't own the intellectual property, nor am I an employee of the corporation that does own it; I'm just a freelance subcontractor. It would be a totally empty assertion with no meaning behind it. Besides, I already do have my own intellectual property, my own original fictional universes. Those are my canons. Those are properties over which I have full ownership rights and I can potentially license out for myself, in a way I can never do with Star Trek. More, they're my own original creations that I can shape however I see fit, which is immensely more satisfying than playing in someone else's sandbox.
If I wanted my work to be Star Trek canon, then I'd do what my friend Kirsten Beyer did and get a job on the writing staff of an actual Star Trek show. But the advantage of that wouldn't be my ability to use the label, because the label is insignificant. The advantage would be that I'd get paid a whole lot more that way, and that my work would be seen by a much larger audience. Fans have the luxury of obsessing over abstractions like what labels mean. Professional writers have more pragmatic concerns.
Oh, speaking of what words mean: The Star Trek tie-ins I write are official. They are authorized and approved by the owners of the property, they are written under contract, and my employer (Pocket Books) and I therefore have a legal right to profit from their sale. That is what "official" means. It has nothing to do with the contents or continuity of the story, merely with whether the owners of the intellectual property have approved its sale. Licensed tie-in books, comics, and games are official. Licensed toys and t-shirts and Christmas ornaments are official, even though they're obviously not part of the story continuity. Unlicensed things like fan fiction and fan films, or like bootleg videos and toys, are not official, because their makers don't have permission from the owner and thus would be committing a crime if they tried to sell them for profit, as opposed to simply making them and giving them away as a hobby.