There is no need to create the team. So long as the project has the team import enabled, SETI.USA will be automatically added on every project. There is somewhere (not sure where though) where the founder can request that the team be added automatically to every project. BJ21 signed up for that years ago. I don't even know if you could turn it off if you wanted to.

Boinc-wide teams:
http://boinc.berkeley.edu/teams/