I've been having problems with this too so I decided to do a little research. First of all, to configure a specific game you just press "x" while the game is selected to bring up a menu.
To get FFT to work you must
1) change BIOS mode to hle.
2) Then go to "set graphics fixes": all options should be off except for use old frame
skipping and framelimit.
3)Next go to "Set CPU Fixes": turn all options off except for parasite eve/vandal
heart fix.
Remember you need to press "x" while Final Fantasy Tactics is selected in the pcsxbox select game menu. I just got this to work about 10 minutes ago so I assure you it works if done correctly. If you can't get it to work make sure you re-read my instructions to make sure you selected the correct options in the menus. Also make sure that you start a new game, don't try to use a save state that was made before you changed the options.
edit: Just for future reference, all of this info was in the compatibility list made by deathx88.
This post has been edited by stark911: Apr 8 2005, 04:32 AM