Working on this came to a new insight;
The DB entries of folders /Sent/Drafts/Trash should move from Sogo to dovecot DB record;
Sogo should not define those folder names, imap sever should.
This would open the way to force use unified of special folders by auto = subscribe those folders IF a value is given in the dovecot db record. They can be any value (language) you want, migration not taken in account.