When Richard Arnold and Gene Roddenberry were starting to promote their use of the term "canon" to quell fan questions about which bits of Star Trek could be considered as "actually happened", there hadn't been any "director's cuts" of any of the movies. I recall Richard saying that the 1989 memo (to the licensees) included in "not canon": ST novels, novelizations (including GR's own), comics, RPG and other manuals, TAS, and live-action footage made for video board games, CD-ROM games and theme park presentations.
GR later "allowed" aspects of Vulcan geography and Spock's early life ("Yesteryear", TAS) and Captain April to be included in the official timelines and encyclopedia. He then described parts of ST V as "apocryphal", meaning that he didn't personally approve of two elements of ST V: the existence of Sybok, and the scene of McCoy mercy killing his own father.
I think I recall RA saying that the TV "longer versions" of TMP and ST II, which had already aired on ABC were not definitive or "canon". So that would include other unused scenes.
But... Since RA is long gone from Paramount, and GR has passed away, no one has ever addressed, officially, whether a director's edition of a ST movie displaces a previous theatrical release. Or the canonical status of CGI additions to TOS, some of which corrected production errors. Hence the ongoing ambiguity.
So... was the Vejur cloud in TMP actually 82 (theatrical and TV premiere), or just 2 (director's edition DVD), AUs in diameter? Who knows, but 2 AUs is still mighty big.