Yesterday I received a feedback comment here, saying that BlueMaemo can be used to control games in some S60 devices (Thanks Hath!!!), so just tried with my 5800 and the result is in the video above . Playing those games with the tv-out feature of the phone is even cooler
Required software and instructions here.
Note: In order to play Quake 2 in the 5800 you need to turn off OpenGL ES in the game menu.