the way of "swap controller" TRUELY WORKS on NA version too.
It's come from 2CH, and a lot of Japanese and Chinese players had test it all ready.
Here are the steps:
1, plug your old PS1 controller into your PS2
2, turn on your PS2 with HDL, select game VP2
3, when game had been loaded, you will be asked to plug a DUAL SHOCK 2 controller (normal PS2 controller)
4, unplug your PS1 controller, and plug your PS2 DUAL SHOCK 2 controller.
5, play it and you can find out that you will never get freezed when get into battle.
thx to zxh @ ps2hd for the steps.