[Dovecot] Pigeonhole and Dovecot2 with custom config file

I start my dovecot with the "-c /path/to/custom/config" option so I can run multiple instances. Been trying out 2.0.1 so I can upgrade my boxes cleanly, but I require managesieve. So after installing the latest sources of the Pigeonhole plugin, I'm getting this when trying to start dovecot:

# /usr/local/sbin/dovecot -c /usr/local/etc/dovecot/dovecot_custom.conf managesieve(root): Fatal: Error reading configuration: net_connect_unix(/usr/local/etc/dovecot/dovecot.conf) failed: No such file or directory doveconf: Error: managesieve-login: dump-capability process returned 89

Running Dovecot 2.0.1 on FreeBSD 8.1.

Any help would be appreciated.

Thanks!

Cassidy