[Mediawiki-l] Disabling 'Create an account'?

[Michael B Allen]

I have an AuthPlugin that authenticates users externally and creates
or updates local accounts as necessary. However, someone can still
click 'Logout' and then 'Create an account'. That makes the plugin
somewhat less authoritative if a user can simply bypass it and create
their own account.

Is there any way to disable the creation of local accounts by users? I
want only my AuthPlugin to be able to creating accounts.

Mike