The presence of Denise Crosby would've turned the film into a bigger disaster than it already was.
Yep. I like the Tasha character, and I really like Denise Crosby! I mean her absolutely no disrespect by this, but IMHO, she's quite a mediocre actress. On long running episodic television, I don't think this is too much of a problem, but giving her a prominent role in what was a relatively high profile franchise movie may not have worked out so well.