Actually it is not possible with ProfileMatic. The gconf commands I posted above change the setting in the UI, but it has no effect. So what I did to ProfileMatic doesn't work. I have removed it now, but the update is pending on Ovi store. If you figure out how to do it so that it works, please post. I'm afraid it requires poking something with mce, and it may be blocked by aegis. But I don't even know what should be sent to mce.