I recently interviewed Robert Meyer Burnett who worked on the DVD of Star Trek V The Final Frontier for Paramount. He revealed some interesting tidbits about how Paramount Legal forced him to cut parts of the audio commentary, and how he'd originally hoped to create a Director's Cut of the film with Shatner but was stymied by budget... http://tng.trekcore.com/bluray/01092013_robmeyerburnett1.html
The fan commentaries for the new BluRay sets are cut and chopped on so many levels. Sometimes they're cut off mid sentence. I hate it when they do this crap.