Huh, every week or so this question arises, it was answered multiple times.
- Yes, technically it will be possible to run psx4all on gcw0
- No, nobody is working on it
- No, we can't install psx emu from chinese clone, it won't work
- No, it's not the problem gcw0
- Yes, it's because of a lack of opengl es drivers
- Yes, it's psx4all for maemo with opengl es video plugin