My v5 NTSC booted it fine from DVD-RW (TDK, 1X) with a no-swap mod and SwapMagic 2.0. May be your media choice/speed or condition of your laser. It did skip a bit on the RW, so your transfer rate may be a bit more critical than with some games. It does have a lot of pretty cut scenes that get rendered on the fly during gameplay, so make sure you use a good disc with a decent burn speed. Remember 1X is not always the best choice. I always get better load times with 2X burns on mid-range media in my Pioneer A04.
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.