Defaut user team: global setting and mass update

One of our customers would like to go from an "open access" model to a team based model. 

Is is possible to globally set the default team for new records or mass-update users' default teams? 

The field does not appear in the mass update sub panel. 

Any suggestion other than a good ol' SQL query? 

Cheers,

Damien

PS : Sugar ENT 7.9