FP125:
there is no option to select Game Image, Only option to select where psx4m-gui should try to find games (doesn't support subdirectories)
tap title -> GUI config -> Rom directory
all games from that directory must be shown in game list, where you can select one game and push start button bellow game list...

impeham: create log(take a look to first post for how-to) with pcsx-rearmed core, frameskip-off, fullscreen-on, threaded sound-off,hwa-gpu-off and send me link(if i can't do something i will resend it to Notaz)