I have to confess that I entirely agree with you, though I love all the props in the TOS movies in general. We're very fortunate to have @racprops and his insights here, but sadly that is the one film in which he didn't participate, from what I understand. Maybe he can point us to some folks who know more though? (I still want to track down anyone who can tell me about Capt. Styles's weirdo swagger stick/riding crop.)
As I mentioned in another thread recently, @Buddahaid is also a resident expert on the beautiful STIII tricorder (and its descendants). He has built so many excellent replicas of it.
Though I tend to be more of a Starfleet prop guy myself, the Klingon stuff is also brilliant, though I believe some of it my have had TMP antecedents. As I recall, much of that stuff came from ILM?