Maybe we can produce a fake multitouch on N900 just like the palm webos emulator for windows. In PC, the touch(mouse) input goes into a small delay time(e.x: 0.3 seconds for each,modifiable by user) allowing user to send the second touch input and so on, after the delay time is over emulator will send them to the virtual device all at once, forcing some kind of multitouch, altough it will distrub the gamers' experience but it's better than no multitouch.
running the games with the windows palm emulator, I have also found that some games(like guitar hero 5) runs in portrait mode(unlike games like NFSUC and sims 3 that would run on landscape mode) so they will need a different kind of orientation and I see;some games require external library that is not available for N900 yet and need to be compiled for it; hope that helps.