[Dovecot] Listen on multiple ports possible using same protocol?

[Michael Durket]

Is it possible to have multiple Listen directives in a dovecot configuration file for the same protocol? I am running dovecot-1.2.11 and I want to be able to use the "standard port" as well as a test port:

   protocol imap {
       listen = *:143
       listen = *:10143
       ssl_listen = *:993
       ssl_listen = *:10993


for example.  Or is this more preferably done by pointing dovecot at different configuration files?