There's a bzr-experts team that has über permissions on branches.
This page logs incidents where members of the team have needed to exercise their super powers.
Incident Log
2009-06-30 abentley: renamed ~launchpad-pqm/oops-tools/trunk to ~launchpad-pqm/oops-tools/trunk-old and ~matsubara/oops-tools/trunk to ~launchpad-pqm/oops-tools/trunk to help Diogo update to 2a format. Used hitchhiker to determine the default stacking branch.
2009-07-03 thumper: deleted a branch with nuclear release codes
2010-02-10 mwhudson: used being able to see the +delete page to tell what a branch was linked to.
Used it a lot with hitchhiker to help people with fubared branch upgrades.