Sorry to double post but user benji posted a patch that makes DOA2 Hardcore work (US version only). I found the corresponding address to patch in the JP version (002b67e8), but the game still crashes. Maybe some PCSX2 devs have a better understanding of what's being patched and if it can be ported to other regions or integrated into PCSX2
http://forums.pcsx2.net/Thread-Dead-or-A...#pid331509
http://forums.pcsx2.net/Thread-Dead-or-A...#pid331509