[development] Drupal SU module anyone?

[Arancaytar Ilyaran]

This is a terrific idea. I wanted something like that too, a few week ago.

Some safety aspects I considered:

- the role assignment should probably be temporary - expiring with the
session, or after a period of idle time.

- the user should maybe reauthenticate (with their own password, or a
root password) when activating su mode.