Also mer could be a possibility for me. Is it working fine on your Nokia 770.
I also have a Nokia 800 working fine with OS2008. Is it possible to load a Nokia 770 OS 2006 version on it, modify it there - flashdump it -and put it back on the N770?
Configuring wlan or bluetooth by editing the configfiles doesn't work for me with that crazy hildon-osso stuff. Or is it better to use scratchbox for that?