OK, I changed the settings, but it didn't work....
Maybe, the only way is to put the plugin files from PJ64 v1.3 to v1.4? Actually, I've tried it before. I used Super Robot Taisen 64 rom to test it, but it didn't work. Whatever plugin I changed, the Super Robot Taisen 64 rom still not work.
It showed "PI_not memory not found" (something like that...). so, I don't want to try it anymore. Just download the PJ64 1.3 and extract it to a new folder and put my save files and R.Racer64 rom on v1.3.
It worked.