[Dovecot] Setting ACL for master user after login

[PL MB]

Hello,

I'd like to log in to normal user accounts as a master user but retain
the normal users' ACLs.

The Master Users page on the Dovecot 1.x wiki (1) says that I can set
the master user's ACLs in a postlogin script.  The documentation for
master users on the 2.x wiki (2) no longer has any statements about
master user ACLs.

Has something important in this regard changed?  Can I no longer
override the ACLs in a postlogin script?

Thanks in advance.

(1) http://wiki.dovecot.org/Authentication/MasterUsers
(2) http://wiki2.dovecot.org/Authentication/MasterUsers