Bad default value for courier-imapd on Debian systems

Today I recognized, that Debian's courier-imapd has a very ugly default value for IMAP_EMPTYTRASH (found in /etc/courier/imapd). This value maybe costs me about 10 hours of additional work to get all trash-mails back from the backups to the corresponding IMAP-folders.

The reason, why my users need there trash folder is that they "archived" their mails in the trash folder which is - of course - not usual, but why not...

So for you guys out there: Comment this setting out. Not mentioning it in the configuration file works well.