I'd be interested to know what shenmue looks like, and if you found and way to hack the hud to be centered
edit: just tried it out myself, it seems some games dont support "extra geometry" and are just rendered black (like Soul Calibur)
In most games, the extra geometry is what the game is trying to render in the background, as seen in REZ.
I was REALLY impressed with Shenmue's dynamic loading - literally everything except the game map is loaded on the fly, out of the edge of the screen - including people, objects, etc - it is really distracting and nearly impossible to play regularly -but still impressive.
Since NullDC went open-source, I'm sure someone can find a way to hack dynamic loading, or to disable it somehow - unless it's hard-coded, which should vary game to game.