It is on you tube, I don't know how he managed to do it, but it is the best way to enjoy this game
http://www.youtube.com/watch?v=S0FRTsCCA7w
http://www.youtube.com/watch?v=S0FRTsCCA7w
you need a psp with hacked firmware.
sadly it does not support variable gas or brake pressure.
Because even using the PSP's digital buttons it shows a gradual increase.
I'm pretty sure we will hear nobody complain they were wrong.funny how the other day i read some guy asking if it was possible for him to connect a wheel to the psp and everyone replied thats impossible