I have tried two dovecot packages, one stable and one from trunk (2.2.15 and 2.2.28). Both are missing the doveadm tool and doveadm-server that's supplied fails with SIGSEGV (11). I have searched but nobody have even mentioned this fact.

What is the reason for excluding doveadm? It's a standard tool coming with dovecot, useful for email backup and such tasks.