It wouldn't occur to me to address Rózsa by his given name in any situation (though I'm sure he was always gracious toward those who did), and he did have that honorific of "Doctor" to fall back on.  One should cut Andre Previn a little slack: unlike most, the younger Previn was Rózsa's colleague at MGM, and one whose musicianship Rózsa respected -- for him, surely the greatest of levelers

Yes, but that's to do with SOCIAL etiquette.  If I met Miklos Rozsa, I'd refer to him as 'Dr. Rozsa' until he invited me to do otherwise, and probably still even then.  But that's not WRITING.  If someone is reviewing or writing an article, or discussing something on a commentary, then that's a whole different slant and opens up the thing to a whole new world of expression, humour, whimsicality, irony, seriousness, academia, etc., etc..  Or SHOULD if you want to have impact.  A totally different set of criteria. 

For example, Mike, who began this thread, used to work on the 'Georgia Strait (sometimes 'Straight')' mag in Vancouver.  (This is no indiscretion to mention, since he's talked about it here).  That was an 'underground' journalism thing, and you could easily see a situation where Rozsa would be (say, in relation to union matters?) quoted humorously alongside somebody like, I dunno, Tiomkin, and they'd be called Miki and Dmitri, like a comedy duo. 

If Rozsa was as stiff and rigid as fans sometimes make out, he'd never have composed the flood of material he did.  We who drink at the well, shouldn't launch a campaign against drills and spades.