i think i might have found a way to play for a bit more then usual
i just used a lot of tips all together
i started the music player (played a song and paused it), started the game, canceled the ingame music.
another tip i got, since it heats up very fast, its good to nodge to the right the battery save option.. it seems to slow down the heat rate

all together used, the game crashed to the main screen after ~2 hours (never did that before, it use to freeze, and after ~5-20 min') and the battery was'nt hot (well it was but not burning hot as usual.. dont have temp' guage)

SGS2, 2.3.4, lite'ning rom 2.0

if anyone try it out, tell me if its working for you too