[Dovecot] Two passwords: One for Dovecot IMAP and One for Dovecot SASL? Is it possible?

[Art Gray - Razorpoint]

Greetings,

Can Dovecot can handle separate authentication for receiving mail  
(IMAPS) and sending mail (SMTPS)?  In the past, we used Dovecot IMAP  
for the receiving part and Cyrus SASL for the sending part.  This  
allowed us to use two passwords with mail.  Cyrus has grown too old  
and isn't useful anymore.  Can Dovecot give us this functionality:   
two passwords, one for IMAP authentication and one for SASL  
authentication?

If so, could you point me in the right direction to get this working?

Thanks in advance,

A