u can use from the front panel this button:
LEFT KEY - RIGHT KEY
UP
LEFT - OK - RIGHT
DOWN
in same games u can use C too (in PGR 3D SIS version)
with the Media Button u came back to media Menü (the game make automatic break/pause). so u cant use them to control the game (only for pause)
ps.the << / >> / > and o button from player u cant use for gaming (to time.. ) its only for the player (hope they change it with NeXtGen games

)