No, I haven't found a solution for that.
Once I have managed to configure pSX, via the flickering menu, I have created individual launchers to launch my games in full-screen so I avoid it. Right-click an empty space on your desktop and select Create Launcher and use the following string in the Command field.
/usr/lib/pSX/pSX -f /games/psx_images/VAGRANT_STORY.mdf
For all the switches available:
[lardy@spring2009 ~]$ /usr/lib/pSX/pSX -h