I know this is an old thread and OP won't answer, but I'm at the same situation, but I'm using ePSXe instead... Can someone help?
As OP wrote, "/path/to/rom/folder/"[romfilename]" doesn't work unless we remove the "[ROM filename]" and specify it with a game. But if I do that, all the game that I choose will play that specific game... Any workaround this please?