I actually disabled the password on my BB and started to play with the script. I have it down to a point where the 'pppd call bb' returns IP, DNS etc. and no loggin errors.
Howevere, the new IP / gateway info is not "linking" to the connection manager to create a net connection.
I use Linpus which has limited functionnalities and the connect manager seems to support only Ethernet and Wifi profiles.
I believe I can update the connect manager but I'm on the road and I have no way to re-load if this thing goes south... so I'll have to wait for the weekend before using brute force.
As a side note the "mass storage" function is buggy. Not sure if Barry caused it but I can browse the BB via Thunar but it freezes when I try to access/move/copy any file..