root@q1s:~# zcat /proc/config.gz | grep RFCOMM                    
CONFIG_BT_RFCOMM=m
# CONFIG_BT_RFCOMM_TTY is not set
root@q1s:~# uname -r
2.6.36-slitaz

would it be possible to have it enabled for 4.0 ? the issue was find when i wrote the bluetooth guide and is still present.
it makes impossible to use a phone as a modem through bluetooth. is there a reason why it is not enabled by default?