I always modify OSInstall by hand.
:-)

EDIT: Oh and by the way, I completely agree that you (or everybody who want to) modify my iso. The last one was not really good and it's cool that, finally, I will not work on it alone anymore !

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB