I am migrating from an older RoundCube where I used the great old sieverules plugin. It had a great feature where, if there was a systemwide sieve default (generally /var/lib/dovecot/sieve/default.sieve for dovecot users), then when a roundcube user first selected filters it would ask if that user wanted to bring in the system default to start with.
Is there a similar feature in managesieve? I cannot seem to get it to recognize the system default on the new server.