Out of the many titles that Sega has released on Dreamcast, I think SoA and the Shenmue games are the only ones that are impractical. Maybe due to size limit, but I won't lose hope. I think I can live without Shenmue, but I'm craving so badly for an 800 Microsoft Points version of SoA with 16:9 and higher resolution, it would look so pretty on my LCD monitor.
Space Channel 5 Part 2 was a curious choice, I'm guessing they're probably using the PS2 source code.