Yes, John, I am a zero fret aficionado, for several reasons - no change in tone between open and fretted strings, hardly ever intonation problems from that end of the neck, no buzz problems on the only zero fret guitar I ever re-jigged, easy to fiddle string height if you take all strings off (but God help you if you take too much off) - so why do more people not use them? I think they ought to provide more sustain too. Even the re-issue Hagstrom SuperSwede (OK it's electric) has abandoned the zero fret of the original.
But are you suggesting I modify a Hagstrom J-45 to fit a zero fret? Sacriledge!