Thank you for the help!
I understand your message about upgrading!, by the way my n900 was rock solid since I've got it (end november) and I did not want to face all the probs that a lot seems to have encountered after firm upgrade...
In other hand, I've been running Letho's kernel (950/500) since it was out 3 days ago and encountered zero problems with it; I just wanted to take the advantages of your modified one!
Anyway, thanks so much