I like handhelds, but not so much to actually go out and buy every single GBA version there is. Books don't let you do anything while paying attention to the story. I'm not getting the DS, that's for sure.
Have you checked the CRC checksums of the untranslated games? If they aren't OK, then the bugs are not the emulator's fault. (In most cases, but not all) Treasure Hunter G has never frozen on me, and I use the 6/09 WIP.
Well, Justice Gakuen is Rival Schools ( the japanese version) and contains only one file that modifies the existing Rival Schools set. I would appreciate it if you'd explain in detail what you did and did ZiNc give any error messages etc,
I'm sure, that anyone who did would have come forward by now. I'd get DC++ and search there. Also, check other P2P networks. (Kazaa Lite, Shareaza, Overnet, etc.)