I might give a go at recoding CS Combined Assault 0.5 for PSP and remaking it to be like Redfaction
it runs with Half-Life 1 Package File (*.pak) and runs off The basic Half life Moding (stuff like *.mdl for the weapons and *.bsp for the maps.....Basicly if you can mod half life you can mod this )
Already the game has a AD-Hoc 1-4 Player mode
all i have to do is find the time between School and work
EDIT/ if somebody can Change the Redfaction weapons to MDLs that would help me out big time
Honestly, I don't think the PSP can run RF. Red Faction renders a lot more faces than either Doom or Half-Life. Even if it could run it performance would be unplayable at best... It worked on the N-Gage because it was redesigned from the ground-up to. Maybe you could port the N-Gage version, but not the PC version.