dovecot - Apr 2014 - Allowing non-SSL connections only for certain Password Databases

I'm trying to set up my system (using Dovecot 2.0.9) so that certain
Password Databases are available over pop3 and imap and others are available
over pop3s and imaps.

In particular, I would like users to be able to connect without SSL to accounts
set up in vpopmail, but to require SSL for system accounts.

Is there a way to set "disable_plaintext_auth" to different values for
different Password Databases? Is there another way to do it?

Thank you,
	Dan

Hi,
>
> Is there a way to set "disable_plaintext_auth" to different
values for different Password Databases? Is there another way to do it?
>
Why do you not force SSL for all users?

I have no idea how this could be made with different databases. I have 
only build a solution for all users stored in mysql.

I'm able to force SSL for imap and pop3 on a per user basis with e.g.:

...
password_query = SELECT password FROM users WHERE userid = '%u' AND 
allow_login = 'y' AND ( force_ssl = 'y' OR '%c' =
'secured');
...

Query adopted from:
http://wiki2.dovecot.org/Authentication/RestrictAccess

For available variables see:
http://wiki2.dovecot.org/Variables

As I just said, this works for me, but only for users stored in mysql.

Regards
Urban